Cannot open the file as 7z archive headers error - Исправление ошибок и поиск оптимальных решений проблем

Содержание

Устранение ошибки «Файл не является 7z архивом»
Вариант 1: Повторное скачивание архива
Вариант 2: Исправление ассоциаций файлов
Вариант 3: Ручное изменение расширения файла
How to Fix 7-zip Headers Error
In this article, you will learn about why your system is experiencing the 7-zip headers error and how to go about fixing this error. The methods provided here are practical solutions that you will surely find helpful in your predicament.
Summary
CONTENT:
Part 1: Why do I See «Header Corrupt» Messages When I Run Self-Extractors?
Part 2: How to Fix 7-zip Header Error
Method 1: Use Another Free Compression Software
Method 2: Run CMD to Repair/Restore Corrupted or Invalid ZIP Files
Method 3: Restore Invalid/Corrupted .zip Files with Stellar File Repair
Part 3: Other Common Errors of 7-zip

Устранение ошибки «Файл не является 7z архивом»

Вариант 1: Повторное скачивание архива

В подавляющем большинстве случаев рассматриваемая ошибка появляется именно из-за того, что сам архив был скачан не до конца. При этом формально браузер может вам сообщить, что интересующий файл был загружен, но по факту либо небольшие проблемы с соединением возникли в процессе скачивания, либо на сервере изначально находится поврежденный файл. Соответственно, у пользователя есть два выхода:

Скачать файл заново, по возможности оптимизировав интернет-соединение.
Найти файл на другом сайте.

Перед попыткой повторного скачивания рекомендуется приостановить любую другую интернет-активность, которая так или иначе может повлиять на закачку. Это обновление ОС, раздача через торрент-клиент, потоковое воспроизведение видео в высоком качестве, скачивание/обновление игр через игровые клиенты и др. Если интернет сам по себе слабый, остановите и другой вид онлайн-активности, не считая мессенджеров и сервисов, практически не перетягивающих на себя ресурсы. Не забудьте выключить VPN в веб-обозревателе или на компьютере, так как особенно бесплатные их версии часто предлагают минимальную скорость обмена данными и становятся виновниками не до конца произведенных закачек.

Возможно, что в нестабильном скачивании файла виноват хостинг, где хранится архив. Попробовать свести к минимуму вероятные разрывы связи можно, используя сторонние менеджеры загрузок типа Download Master.

Рекомендуется также проверить, не виноваты ли другие ваши действия в том, что через браузер все загрузки происходят медленно.

Если же после выполнения всех рекомендаций ситуация не изменилась, вполне вероятно, что вы загружаете изначально «битый» файл — то есть архив с ошибками, которые произошли в результате сжатия или при загрузке на сервер. Подобное может исправить только автор архива, пересоздав его или закачав повторно. Вам же остается либо связаться с ним, либо поискать этот же файл на другом сайте.

При условии, что загрузка происходит не в браузере, а через клиент-программу, например для установки драйвера, осуществите все рекомендации по приостановке параллельного выполнения других задач, требующих интернет-соединения. По возможности смените подключение с Wi-Fi на LAN (если вы, конечно, используете беспроводное соединение) и проверьте, насколько быстро интернет работает в целом.

Иногда неполадки со скачиванием с конкретного сайта/сервера носят временный характер, поэтому есть смысл подождать некоторое время и повторить операцию.

Вариант 2: Исправление ассоциаций файлов

Реже причиной становится слетевшие ассоциации файлов в операционной системе, из-за чего Windows не может распознать EXE-файл и выдает ошибку «Файл не является 7z архивом». При этом могут перестать запускаться и другие EXE, а не только тот, который вы пытаетесь открыть. В связи с этим следует попробовать восстановить ассоциации файлов, чтобы система снова «поняла», как ей нужно обрабатывать формат EXE. Сделать это можно по инструкции из Способа 1 статьи, ссылка на которую расположена чуть ниже. При этом можете повторить и другие советы оттуда же, если первый оказался бесполезным.

Подробнее: Что делать, если EXE-файлы не запускаются

Вариант 3: Ручное изменение расширения файла

Есть вероятность, что трудность заключается в расширении файла, а точнее его отсутствии или ручном изменении. Обычно помогает самостоятельное переименование расширения, но сразу же стоит отметить, что если вы уже получили файл без расширения, данный метод не гарантирует стопроцентное исправление ошибки.

Первое, что вам нужно узнать — видны ли в названиях файлов их расширения («.exe», «.rar», «.mp3» и др.). Если нет, включите их отображение: откройте «Проводник», нажмите на вкладку «Вид» и вызовите окно «Параметры».
Переключитесь на вкладку «Вид» и найдите пункт «Скрывать расширения для зарегистрированных типов файлов» и снимите галочку, после чего нажмите кнопку «ОК».

В редких случаях может помочь отключение антивируса (преимущественно при установке драйвера, который защитное приложение хочет заблокировать) или файервола.

Источник

In this article, you will learn about why your system is experiencing the 7-zip headers error and how to go about fixing this error. The methods provided here are practical solutions that you will surely find helpful in your predicament.

Amy Dennis

Dec 22, 2022 вЂў Filed to: Recover Files вЂў Proven solutions

Summary

7-zip is a software that is used to compress a large number of files on computers, the format of which is .7z. However, this compressor is prone to corruption which causes errors such as the «headers» error. Nobody likes encountering errors when using their computer so seeing an error after downloading a zip file can be frustrating, especially since the error makes opening the zip file an impossibility.

Sometimes, your computer may be infected with viruses from downloads, floppy disk, or through the executable file you introduce into it from another infected computer; you may not realize there is a problem until you get the error message preventing you from extracting your Zip files. Therefore, this article will show you how viruses and other factors cause the headers error to your Zip files. More importantly, how to fix these errors using some methods, the most important being with the use of Stellar File Repair.

CONTENT:

When running self-extractors, you may run into a «header corrupt» error message on your screen, for instance, the WinZip «header corrupt» message shows like this:

Below are major reasons why you may see the «header corrupt» error message when trying to extract Zip files:

The «header corrupt» message may be due to complications in the process of installation of programs you have downloaded, such as WinZip, 7-zip, Matlab, PalTalk, and so on. Therefore, there is a great chance that these applications are experiencing a malfunction in getting installed, thereby causing you to see the «header corrupt» error message.
The «header corrupt» messages that show up when running self-extractors could be because your system has been infected by various virus programs. Here, particular emphasis is placed on the CIH virus as a cause of this error. CIH virus is a highly destructive Microsoft Windows virus that renders your system vulnerable and overwrites important information on your infected system. It may go as far as destroying your system BIOS. The CIH virus is the most common cause of this error in a great number of executables files, such as self-extracting Zip files.
Besides, self-extractors can become corrupted when an error is introduced to the file during the process of downloads, for instance, noise from phone lines. It could also be because of an interruption from the internet when you are downloading the program.
The header error can also occur due to the sudden shutdown of your system as a result of power failure. When you are still in the process of extracting or uncompressing your zip file and a system shutdown interrupts it, you may not be able to access the file when next you try to extract it.

Method 1: Use Another Free Compression Software

The problem of opening your zip files with 7-zip can be resolved if you attempt using another free compression software in place of 7-zip. There are many other compression software available online for free; 7-zip is not the only open-source tool out there. Some of the best alternatives to 7-zip are briefly introduced below:

WinZip:В This is one of the most popular compression software used for both compression and extraction of files, as well as for the sharing and protection of your files with efficiency. Its encryption is of a banking-grade and it supports the zipping and sending of large files using its ZipSend feature.

WinRar:В Another popularly used utility tool, WinRar is great for the compression of multimedia files. You can also compress files in batch using the WinRar feature called «solid archive box». Although it mainly works with «raw» files, WinRar also supports compression of other formats, one of which is the «zip» format.

PeaZip:В The PeaZip free compression tool is the ideal tool to use if you work with Zip files regularly. It makes file compression and archiving very easy. This file compressor software supports over 150 various formats with its large number of advanced features.

Zip wire:В This is an excellent file compression software that works on Windows-based systems. All major archive formats are supported by Zipware for both small and large files. You can as well perform your compression functions directly from Windows Explorer.

These are just a few from the many options out there for file compression so you can check them out.

Method 2: Run CMD to Repair/Restore Corrupted or Invalid ZIP Files

Another method of fixing the header error of your 7-zip file is to use the command prompt i.e run CMD to repair or restore the corrupted/invalid Zip file. Use these steps and you will fix the error:

Step 1:В Open the «Command Prompt» of your system as an administrator and not as a standard user. The steps to do this vary for different Windows OS versions as seen below:

For Windows 7, Vista, 8, and XP:

Select the «Start» button
Go to «All Programs» and then «Accessories»

Right-click on the «Command Prompt» button and opt for «Run as administrator»

For Windows 8.1 and 10:
1. Right-click on the «Start» button
2. Select the option «Command Prompt (Admin)

Step 2:В Change the directories to the original location of your corrupt Zip files.

Step 3:В Type in the command:

«C:Program FilesWinZipwzzip» вЂ“yf zipfile.zip

Step 4:В Press the «Enter» key on your keyboard to run the command. Note that instead of «zipfile.zip», you may decide to use the name of your Zip file to find the invalid or corrupt files.

Method 3: Restore Invalid/Corrupted .zip Files with Stellar File Repair

Repairit File RepairВ is a great tool you can use to restore your corrupted or invalid .zip files. It is a toolkit used in resolving different types of file corruption challenges that are associated with Microsoft but it is mainly used to repair and restore corrupted files. Stellar File Repair supports the repairs of corrupt files on Word, Excel, PowerPoints, and of course Zip files. More so, it is very easy to use as anyone can make use of it to repair their corrupted files.

Use the following simple steps to restore your corrupted or damaged Zip files with Stellar File Repair:

Choose the location of the corrupt Zip file so you can search for it in drive

In the result section, you will find all the corrupt Zip files that need repair. Select «Repair» to begin the repair process.

Choose any location you wish and save the repaired Zip files.

Part 3: Other Common Errors of 7-zip

Apart from the «header error», there are other common errors associated with 7-zip when it comes to compressing or extracting Zip files; they include:

An Unexpected End of Data:В This error occurs when you try to extract your files from the archive of 7-zip and it simply means that the file (the 7-zip format) wasn’t completely downloaded or it got corrupt in the process.

Invalid Compressed Folder:В This error occurs as a result of data corruption which makes your .zip file unreadable. If this error occurs, you will receive an error message that says: «Windows cannot open the folder. The Compressed (zipped) Folder ‘C:Pathtofile.zip’ is invalid». Data corruption caused by some malware, slow downloads, and error in the 7-zip tool itself can cause the «invalid error».

Incomplete Extraction:В Sometimes, you may not be able to extract a .zip file that has been downloaded from Windows Explorer and instead, you will see the error message in the image below:

Files are usually extracted into the temp folder from .zip files but if this doesn’t happen, then there is a problem with your temp folder.

The inability for 7-zip to Open as an Archive:В You may open your archived file for extraction, only to be confronted with the error message in the image below:

This implies that some headers cannot be opened by 7-zip from either the start or the end of the archive.

Errors in Data for Archival Files:В Another error occurs when you cannot perform the «Extract» or «Test» function to view your files even if you have opened the archive and have seen the list of files inside. In this case, the error is as a result of damage or alteration to the data in the files themselves, known as Data Error or CRC Error.

Источник

Запаковал в винде многотомный архив, залил на сервер, попробовал раскаковать командой:

7z x arch.7z.001

Получил:

Open ERROR: Can not open the file as [7z] archive


ERRORS:
Headers Error
WARNINGS:
There are data after the end of archive

задан 16 сен 2016 в 11:55

Установи пакет

sudo apt-get install p7zip-full

И пробуй тоже самое, что ты делаешь.

7z x arch.7z.001

ответ дан 20 сен 2016 в 13:46

Evgeniy AEvgeniy A

4246 серебряных знаков15 бронзовых знаков

Проблема решилась так: сверил размеры всех закачанных на сервер частей архива с частями на компе и перезалил те части размер которых не совпадал. В итоге архив распаковался.

PS. Другая проблема в том, что каждый раз размер какого нибудь куска не совпадает и приходиться перезакачивать его заново.

ответ дан 22 сен 2016 в 1:28

НовичокНовичок

6093 серебряных знака11 бронзовых знаков

Источник

How to Fix 7-Zip Cannot Open File as Archive Error? When you’re dealing with large files for a project, archiving tools like 7Zip come in handy. They compress large files into a compression container called an archive. So instead of sending and sharing these files one by one, you can keep them all in the same place. However, sometimes you could encounter the 7Zip cannot open file as archive, which could give you a headache.

These errors happen due to several factors. In this guide, we’ll be showing you how to fix this error using several methods. But before we do, we invite you to check out other 7Zip guides and fixes on 7Zip Help.

Contents

1 Sources of 7Zip Cannot Open File as Archive File Errors
2 Fixing Archive Errors
3 Using Repair Software to Fix Archive Errors
4 Using Yodot
- - 4.0.1 How Do You Fix 7Zip Cannot Open File as Archive
5 Other Sources of 7Zip File Archive Errors
- 5.1 Frequently Asked Questions
  - 5.1.1 7Zip Cannot Open File as Archive: Conclusion

Sources of 7Zip Cannot Open File as Archive File Errors

Before we discuss how to fix this error, make sure that the file format is compatible with 7Zip. There are other archiving software such as WinRAR and WinZip that might work for your file format. These archiving tools are legitimate software that will secure your data.

To determine the appropriate method for fixing the error, we must first determine the cause of the error. Let us first look at the structure of an archive file.

As we’ve mentioned in other articles, 7Zip is an open-source archiving tool that produces compression containers called archives. The software can create archives in various operating systems like Windows, Mac, and Linux. The archives are composed of four kinds of blocks that carry data. These blocks are the following:

The start header is 32 bytes in size. This header contains the signature and a link to the End Header
The compressed data of your files
The compressed metadata block for the compressed files. This block contains links to Compressed Data, information about the compression methods, CRC, file names, the sizes of these files, and the timestamps.
The end header which has the link to the Compressed Metadata Block

When there is an issue in any or several of these blocks, you will encounter an error. The most common issue faced by users is the 7Zip cannot open file as archive. Here are some reasons why you encounter this error:

The archive has a wrong or incorrect header
The software is unable to open some headers from the start or the end of an archive
The archive is corrupted and has no definite link to the end header
The overall size of the archive creates the issue
The end archive is corrupted or missing

Fixing Archive Errors

Now that we’ve identified where these errors come from, we can now discuss how to fix these errors. To fix these errors, you can try using a hex editor or third-party software to take care of it.

For more advanced users who are familiar with the structure of archive files, using the hex editor would be best. As long as you have the latest version of 7Zip and a hex editor like FAR Manager, then you’re good to go. The official website of 7Zip provided a manual for troubleshooting these errors.

Aside from fixing errors, you can also learn how to run 7Zip through the command line and put passwords on your archives in our other articles.

Using Repair Software to Fix Archive Errors

Another option that you can use in fixing errors is using software to make the repairs for you. It’s quite challenging to learn hex editors if you have a limited background. This is the reason why software like Yodot is a popular option for repairing corrupted archive files.

Using Yodot

Yodot repairs corrupted archives. The software scans everything to rule out the source of corruption. This software extracts all the data that are inaccessible using other repair methods.

Aside from repairing the “7Zip cannot open a file as archive” error, Yodot can also help you solve other archive issues. These include “not a RAR file,” “RAR archive could not be decompressed entirely,” and other errors that appear while extracting RAR files.

Yodot is compatible with Windows 2003, Server 2008, XP, and Vista, 7, 8, 8.1, and 10 OS. Follow the steps below to resolve the error:

Download and install Yodot ZIP Repair software on your device
Once done, launch the application
Select the 7z archive by clicking on the Browse button
Click on the Repair button
Verify the repaired 7Zip archive files and folders by looking at the Repaired File Contents window
Click on Select Folder to specify the location where the fixed 7Zip archive can be saved
The repaired archive could now be extracted without any issues

How Do You Fix 7Zip Cannot Open File as Archive

There are several ways to fix 7Zip cannot open fiile as archive. One of the simplest way is that you can try to re-install and re-create the compressed file.

If you have a 7Zip archive and are receiving the error message that it cannot open file as archive, you may need to find out how to fix the problem. This error occurs when part of the zipped file becomes corrupt, and the user is unable to open the file. Thankfully, you can solve this problem easily. There are several methods you can try to fix the problem, including re-downloading the file, using a third-party program, or using a repair tool.

If you have the file in your computer, you can use Windows Explorer to open it. Right-click the zip file, and choose Open. Once it opens, you can view the files inside the zip file. Alternatively, you can also use a third-party utility to open the file.

The first thing you should do if you are experiencing the error is to check the files in the archive for errors. You should first look for the Start Header and End Header. Each file has a CRC value, which is a type of cyclical redundancy check. These values are used to determine the integrity of the data in a file. When the Start Header or End Header are incorrect, the zip file will not open.

If you are able to locate the Start and End Headers, you should be able to fix the problem on your own. However, you might need to turn to a third-party tool if you are an advanced user. A hex editor is one of the best tools to use for this purpose.

Another way to get rid of the problem is to re-download the entire archive. By doing this, you can ensure that the file is not damaged. It’s not uncommon for a file to become corrupt during downloads or during interruptions in copying or moving. Re-downloading the zip file can help you fix the problem.

You can also use a hex editor to look at the contents of the archive. This can help you identify the areas of the zip file that are damaged. In addition, hex editors can help you repair damaged data blocks. To do this, you need to locate the Start and End Headers and remove any bits of information from each.

After removing the errors from the files, you can re-download the files. Depending on your Windows version, you may need to change the default extraction location to the same folder as the zip file.

For users who have a corrupted data block, you can try re-downloading the entire archive or using a repair tool. This can fix the problem and allow you to keep sharing the files. However, if the issue is not resolved, you may need to reinstall the 7Zip software. You can also try the Test and Extract command to find out if it fixes the problem.

If you are having a hard time repairing your archive with a hex editor, you can always consider downloading a repair tool. You can choose from a variety of free and paid options. Using a tool will ensure that the files are repaired, and you can also choose to save the repaired files on a new hard disk location.

Other Sources of 7Zip File Archive Errors

Another error that you can encounter is the CRC error. The Cyclical Redundancy Check (CRC) value is used to check the data integrity of a file. Each file has a CRC value associated with it. When extracting an archive, tools match these CRC values with the existing value of the file.

Errors occur when these two values don’t match. Whenever you encounter this type of error, this means that the CRC value is changed or corrupted. There are many reasons why CRC errors happen, such as:

Transfer errors. Errors could occur when you move a 7Zip file to another location
Incomplete downloads. Errors or interruptions while downloading archive files can result in CRC errors during the extraction process
Other reasons such as malfunctioning of the archiving tool or damage in the physical drive

Other errors could also occur because of the file itself. This is what you call non-7Zip archive errors. Here are the common reasons why you might encounter them:

Incomplete download
7Zip installation errors
Driver updates

Frequently Asked Questions

Why does 7Zip say I cannot open a RAR file as an archive?

When you encounter this error message, it means that the RAR file is corrupted or has encountered an error. Whenever you encounter this error, there are several reasons for this which include:
u003e Errors in the data blocks of the archive
u003e Incomplete downloads
u003e Transfer errors
u003e Damages on the physical drive
u003e 7Zip installation errors
u003e Driver updates

Windows 10 how to fix cannot open a file as archive 7Zip?

When you identify the source of the error, you could apply different methods for it. If you find out that one or several data blocks of the archive is corrupted, you can try fixing it using the hex editor. But if you’re not familiar with the hex editor, you could also try to use third-party software like Yodot or Stellar Phoenix Zip Recovery.

What to do when 7Zip says cannot open a file as an archive?

This means that your archive file has just encountered an error. You can try fixing it using a hex editor or third-party software. If this doesn’t work, you can try re-downloading the archive file from its source or change the flash drive that you are using to save it.

7Zip Cannot Open File as Archive: Conclusion

There are a lot of reasons why you might encounter errors while extracting archive files. As long as you can determine the sources of these errors, it would be easier to determine which method will be useful in solving them.

In this guide, we’ve shown you the sources of errors and how you might be able to fix them. In case you encounter the same error, let us know if the solutions presented above are effective. If you’ve got questions or suggestions about our guide, leave us a message on the comment section below.

7zip cannot open file as archive

Источник

Download PC Repair Tool to quickly find & fix Windows errors automatically

A compressed version of files, popularly known as zipped files are convenient but also prone to errors. So, when you attempt to open such files using freeware utilities like 7-Zip, you may encounter an error, saying Cannot open file as archive. Let us see what you can do about it.

7-Zip cannot open file as archive error

7-Zip is an excellent open-source file archiver. It can compress files within archives and read and write many other archive formats like ZIP, WIM, and GZIP. Sometimes, due to internet interruptions during file download or other problems, it may fail to open the file as an archive. Try these suggestions to fix the problem.

Re-download or re-create the compressed archive file
Use a ZIP Repair freeware
Repair ZIP archive using WinRAR utility
Use Command Prompt tool
Check the Headers in Hex Editor.

The zip file format is one of the most popular forms of data storage. It is widely used for backup and transfer of information over the Internet. If you can’t open the file as an archive, do the following.

1] Re-download or re-create the compressed archive file

If you download the file, download it again to a different location and see. If you created it, re-create it again to a different location and see if it helps.

2] Use a ZIP Repair freeware

You can use one of these free software to repair corrupted and damaged compressed and zip files.

3] Repair ZIP archive using WinRAR utility

If it appears your ZIP file is corrupted then try to repair the corrupted ZIP archive using the WinRAR utility. The tool is equipped with a built-in repair feature that can repair corrupted RAR as well as the ZIP archive.

Launch the WinRAR tool, click on the File tab and select the Open option.

Then, under the Find Archive window, locate the corrupted ZIP file and select it.

Hit the Tools tab. Later, choose the Repair archive option.

Now, in the Repairing File name.ZIP window, click on the Browse button to select a location for the newly repaired ZIP archive.

Check the Treat the corrupt archive as ZIP box.

When done, hit the OK button to start the repairing process.

Upon completion, click Close to exit.

4] Run Command Prompt

If there’s an incorrect header at the start or end of the file, you will see this 7-Zip cannot open the file as an archive error message. You can try to repair the incorrect end header through Command Prompt. Here’s how!

Launch Command Prompt with Administrator privileges.

Type the following command and hit Enter –

“C:Program FilesWinZipwzzip” –yf zipfile.zip

(Make sure, you replace “zipfile.zip” with the name of your Zip file). The double quotes in the example above are necessary due to the space between “Program” and “Files”.

This will repair the file.

5] Check the Headers in Hex Editor

If you try to open or extract an archive and you see the message “Can not open file as archive“, it means that 7-Zip can’t open some header from the start or from the end of the archive. In that case, you must open the archive in a Hex Editor and look for the Start Header and End Header.

If the start of the archive is corrupted, then there is no link to the End Header. But if the End Header is OK, and the size of the archive is also correct, you can replace data in Start Header in a hex editor with the following values:
0000000000: 37 7A BC AF 27 1C 00 04 00 00 00 00 00 00 00 00
0000000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Then try to open the archive, if you can open it and you see the list of files, try the Test or Extract command.
Start Header and End Header are OK, but the total size of the archive is not OK. You can calculate the correct size of the archive from values in the Start Header. Then you must recover the correct size. You can insert some data or remove some data somewhere in the archive.

What does Not a valid archive mean?

In simple language, not a valid archive means there’s some problem with the archive. It can happen either during copy or move operation or when part of the zip file becomes corrupt due to an interruption in download. This can be solved by discarding the damaged file and downloading a new copy.

Ezoic

A post-graduate in Biotechnology, Hemant switched gears to writing about Microsoft technologies and has been a contributor to TheWindowsClub since then. When he is not working, you can usually find him out traveling to different places or indulging himself in binge-watching.

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Содержание

Вариант 1: Повторное скачивание архива
Вариант 2: Исправление ассоциаций файлов
Вариант 3: Ручное изменение расширения файла
Вопросы и ответы

Вариант 1: Повторное скачивание архива

Скачать файл заново, по возможности оптимизировав интернет-соединение.
Найти файл на другом сайте.

Читайте также: Использование менеджера загрузок Download Master

Подробнее: Причины низкой скорости скачивания в браузере

Иногда неполадки со скачиванием с конкретного сайта/сервера носят временный характер, поэтому есть смысл подождать некоторое время и повторить операцию.

Вариант 2: Исправление ассоциаций файлов

Подробнее: Что делать, если EXE-файлы не запускаются

Вариант 3: Ручное изменение расширения файла

Первое, что вам нужно узнать — видны ли в названиях файлов их расширения («.exe», «.rar», «.mp3» и др.). Если нет, включите их отображение: откройте «Проводник», нажмите на вкладку «Вид» и вызовите окно «Параметры».

Переключитесь на вкладку «Вид» и найдите пункт «Скрывать расширения для зарегистрированных типов файлов» и снимите галочку, после чего нажмите кнопку «ОК».

Теперь вернитесь к файлу, который не удается открыть, нажмите по нему правой кнопкой мыши и перейдите к переименованию.

Если вы скачивали предположительно архив, допишите ему расширение «.rar», если это был установочный файл, допишите «.exe». После успешного переименования попытайтесь запустить файл.

В редких случаях может помочь отключение антивируса (преимущественно при установке драйвера, который защитное приложение хочет заблокировать) или файервола.

Читайте также:
Отключение антивируса
Настройка файервола в Windows 10 / Windows 7

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7-Zip

A free file archiver for extremely high compression

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Битые архивы. Ошибка заголовка

Created:

2022-03-21

Updated:

2022-03-23

Здравствуйте!
есть 3 битых архива с паролем.
По статье https://www.7-zip.org/recover.html восстановить не получается.
Помогите, пожалуйста, восстановить данные

Пример одного из файлов
Start Header
37 7a bc af 27 1c 00 04 b9 9e 90 10 e5 28 a0 01
00 00 00 00 25 00 00 00 00 00 00 00 01 92 c8 02

Start of compressed data.
02 e0 24 c3 ..

по расчетам и Headerа длина файла должна быть 27 273 514 байт
мой файл 27 209 728 байт
попробовал дополнить файл на 63 786 байта из подобного архива, с тем же паролем,

7z t a.7z -bb9 -pYourPassword -bse1 > test.txt
выдает ошибку
Open ERROR: Can not open the file as [7z] archive

ERRORS:
Headers Error

Can’t open as archive: 1
Files: 0
Size: 0
Compressed: 0

Last edit: Who Is Absent 2022-03-21

show last 128 bytes in hex.

последние 128 байт
44 6e 26 2c 8c 88 04 b7 08 c3 5b 85 46 54 c1 f4
80 f4 8d 29 91 98 52 92 86 d6 11 a4 58 0a 3a 5e
3e bb b9 19 02 eb a3 7e dd 56 7f dd 6e a0 24 11
c5 04 d4 87 7f 4c c3 9c 2f bc 2b 14 70 35 ee 46
77 c1 22 16 26 8b 2e b5 a6 06 cb 64 00 4c e7 aa
90 23 8d 67 ea 54 35 0c 00 00 17 06 e1 b0 c0 76
01 09 98 e3 00 07 0b 01 00 01 23 03 01 01 05 5d
00 00 01 00 0c c0 62 ee 0a 01 1f 8f 67 3f 00 00

Last edit: Who Is Absent 2022-03-21

The end of archive looks correct.
You must insert some data in the middle of archive.
Split the archive into 3 parts:
part-1 — big part
part-2 — 1 byte
part-3 — about 1 MB

then increase the size of part-2 with any data such way that total size of all parts will be equal to size of original archive as pointed in header.
Then try to open it.

исходные данные.
не полный архив с паролем
размер 5 766 381 568 байт
1. вычитал header 20 байт
37 7a bc af 27 1c 00 04 78 4f 7d cc 54 ca 8f 62
01 00 00 00 29 00 00 00 00 00 00 00 5d a8 4e
2. размер файла должен быть 5 948 557 908
3. обозвал исходный файл 1.7z.001
4. создал 1.7z.003 нулями и последние 128 байт добавил из аналогичного архива
5. разделил файл 1.7z.001 на две равные части и назвал их 1.7z.001 и 1.7z.002 каждый по 2883190784 байт
header не правил во второй и третий файлы header не добавлял
по итогу файл не распаковывается
ругается на Ошибки в заголовках

there are two different situations for recovering:
situation-1 : if you have correct end header in last 128 bytes,
then insert data in the middle.

situation-2 : if you have no correct end header in last 128 bytes
use end header from another archive. But if archive was encrypted, then IV will be different and you will get incorrect first 16 bytes of lzma2 stream. So data recovering can be much more more difficult for encryped archive, if you have no correct end header. You must develop special software in that case that will help to recover the data.

Also if you have many corrupted archives, try to analyze all cases of correct archives and incorrect archives, and try to find the reason of corruption. Analyze original and corrupted sizes and data.

у меня вторая ситуация.
огромное СПАСИБО за развернутые ответы!

in previous message you showed last 128 with correct end header.
So you had situation-1 in that case.

эти 128байт(footer) были взяты из другого архива с другими данными и другого размера но с тем же паролем.
при добавлении их в в конец архива я получаю ошибку «Ошибки в заголовках» т.к. header я не исправлял, он как был, так остался оригинальным.
footer оригинального архива отсутствует.

Then that your information was useless. I know that corect archive has correct end header.
I asked you to show real last 128 bytes of corrupted archive.

Last edit: Igor Pavlov 2022-03-23

пример поврежденного файла

header
37 7a bc af 27 1c 00 04 b9 9e 90 10 e5 28 a0 01
00 00 00 00 25 00 00 00 00 00 00 00 01 92 c8 02

footer
92 52 ba 47 85 98 a8 7a a8 b7 1a 71 5a 0d cc 54
32 55 2c 8a 1a 4f 7c b1 40 46 64 5b b1 ce e1 bf
45 ac be 0d 9e ed 4a 36 ed fa d6 65 3f f4 c6 c1
70 46 ad 43 b0 48 de d3 11 26 3e f6 fd 41 78 7d
d5 34 e5 8a e4 87 36 7c 54 7e 01 15 5b 28 e9 f2
44 27 18 f9 11 b4 88 36 f8 23 94 1a 05 68 1f 6c
75 cc 6a a2 46 82 6a 16 80 29 64 3f 20 df aa d3
30 ef 7f 87 71 d6 20 08 9f 87 0b 7b 9f a2 a7 93

размер поврежденного файла 27 209 728 байт

Last edit: Who Is Absent 2022-03-23

To recover data you need to recover 128-bit IV for AES-CBC that was stored in missing footer.
So you need original uncompressed data (at least 32 bytes) from first file in archive. Then you compress it with lzma2 and use it to recover AES-IV.

original_data -> lzma2_compressed_data lzma2_compressed_data + password + IV -> encrypted_data

you have encrypted_data and password.
so you need original_data or lzma2_compressed_data to recover IV. You can try to search first file another good 7z archives that were created for same data set.

Also you must develop special modified 7-Zip that will be used for recovering using different sources: corruped archive, recovered IV and so on.

Note also that only raw data stream recovering is possible. You will not get any file names, sizes and so on.
Last edit: Igor Pavlov 2022-03-23

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Updated on May 13, 2022

If you are looking for the best ways to fix the 7Zip cannot open files as archive error, then you are in right place. This guide consists of various solutions to fix “Cannot open file 7zip as archive” and the reasons behind this error. To know more, continue reading this article.

When you are dealing with a number of large files and want to share them via email then you need to compress the files. The large files are compressed into a container which is called an archive. 7-Zip is a free open source file archiver that owns an archive format called 7z, however, it can read and write several other file formats also.

Basically, a 7z archive file contains 4 main blocks of data:

Start Header
Compressed Data
Compressed Metadata
End Header

Unfortunately, you might come across a 7 Zip cannot open file as archive error which can be irritating. This error happens due to various factors, don’t worry you can fix this “Can’t open 7z file as archive” error with ease.

Common Scenarios in Which “7zip Cannot Open File as Archive” Error Occurs

You may face certain errors while extracting the 7z archive if the archive is corrupted. Below mentioned are the two common cases that arise with the 7ZIP archive files:

Case1: You are able to open the 7z archive and can notice a list of files. But when you try to extract, you will get a few errors like Data Error, and CRC Error.

Case2: You can’t open the 7-ZIP archive. When you try to open it you may see the message “cannot open file ‘a.7z’ as archive”.

How Do You Fix 7-Zip Cannot Open File As Archive?

Try Re-downloading Or Re-creating The Compressed Archive File

You can fix the cannot open 7-Zip archive error just by downloading the 7z archive file again, but save it in a different location. However, if you have created or compressed the 7z file try re-creating it again to a different location and see if it is helpful.

Use Another Application to Open The 7z Archive File

Sometimes cannot open the 7 ZIP archive file issue might be with the 7-Zip program, so you can try opening the 7z archive file using some other program to solve the issue. You can try using WinRAR or any other well-known application.

If you were able to fix the “cannot open the 7z archive file” error with the above-mentioned methods well and good, if not your 7z archive might be corrupted. You use the below-mentioned methods to repair the corrupted 7-ZIP file.

Check The Headers Using Hex Editor To Fix 7zip Cannot Open File As Archive Error

In the case of 7-ZIP corruption, there might be some issue with the Start Header or End Header. So keep the original 7z archive intact and open copied folder in a hex editor (do not alter the original file) and check Start and End Headers to fix the issue.

If the Start Header of the archive malfunctions, then there will be no linkage to the End Header. In this case, if the End Header is fine and the size of the archive is accurate then you can replace data in Start Header in the hex editor with the following values and try to open the archive. If you are able to open and see a list of files then extract it.

0000000000: 37 7A BC AF 27 1C 00 04 00 00 00 00 00 00 00 00

0000000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Both Start and End Header are fine, but if the total size of the archive is incorrect then you can compute the correct size of the archive from the values of Start Header. Make the size of the archive correct by adding or removing some data somewhere in the archive.

After trying the above techniques you should be able to extract the 7Z archive. If you still face the ‘7ZIP unable to open the file as archive’ error then it is time to utilize the
Yodot ZIP Repair tool as the 7-ZIP archive is severely damaged and you cannot fix it manually.

Use Repair Software To Fix 7zip Cannot Open File As Archive Error — Yodot ZIP Repair

Yodot ZIP Repair is the idle software to fix the 7z archive when you receive cannot open file x.7z as an archive error during the extraction process. It is one of the best utilities to help repair corrupt or inaccessible 7-ZIP files on Windows operating computers. Download the Yodot ZIP Repair tool for free and fix the 7zip cannot open file as archive error with just 3 steps.

Note: Along with fixing the 7-ZIP archive, Yodot assists you to fix non 7ZIP archive errors in ZIP & ZIPX files.

Simple steps to resolve 7zip cannot open file as archive:

Download the Yodot ZIP Repair software and install it on your system.

Run the application, select the 7z archive by clicking the Browse button, and hit on Repair button.

Verify repaired 7-ZIP archive files and folders in Repaired File Contents window and click on Select Folder to mention the location where the fixed 7-ZIP archive can be saved

Tips To Avoid An Archive Error:

Monitor your computer using the good AV tool to avoid archive corruption.
Never download a ZIP archive on slow speed internet.

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