How to Fix When 7ZIP Says Cannot Open File As Archive?

“I was in need to compress a large amount of files into a 7-ZIP archive and I did it last week. Everything went well. So I deleted those source files, then plugged the USB after copying 7z archive to it. Now I am trying to open the archive but I am getting an error message stating that cannot open file 'a.7z' as archive. Any ideas why this is happening? Is there any way through which I can recover files that are inside the archive? Those files are very important for me, kindly help me.”

You may face certain errors while extracting 7z archive if the archive is corrupted. There are few possible cases when 7-ZIP archive is corrupted:

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

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

In this case due to corruption 7-ZIP can't open some header from start or end of archive. So keep the original 7z archive in-tact and open copied folder in hex editor (do not alter original file) and check Start and End Headers to fix the issue.

  • If Start Header of archive is malfunctioned, then there will be no linkage to End Header. In this case if End Header is fine and size of archive is accurate then you can replace data in Start Header in hex editor with following values and try to open archive. If you are able to open and see 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 total size of archive is incorrect then you can compute correct size of archive from values of Start Header. Make size of archive correct by adding or removing some data somewhere in archive

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

Precise program to fix 7Zip file that says can't open file as archive:

Yodot is the idle software to fix 7z archive when you recieve cannot open file xxx.7z as archive error during extraction process. It is one of the appropriate utility to help repair corrupt or inaccessible 7-ZIP file on Windows operating computers. It is possessed with modern scanning mechanism to repair damaged .7z files and without doubt extracts each and every file present in it. Including 7-ZIP files, you can even fix non 7ZIP archive error in ZIP & ZIPX files using this application. The idle program helps you in fixing encrypted 7-ZIP files effectively. This tool is built with read-only technology which helps in fixation of severely corrupted 7-ZIP file without modifying its structure. It fixes 7-ZIP archives present on internal and external hard drives and also on other storage devices. You can make use of this tool on Windows computers running with Windows Server 2003, Server 2008, XP, Vista, 7, 8, 8.1 and 10 operating systems.

Along with fixing 7-ZIP archive Yodot assists you in repairing other archive issues like not a RAR file, RAR archive could not be decompressed entirely, etc which appears while extracting RAR files.

Simple procedure to resolve cannot open as an archive 7z error:

  • Obtain Yodot ZIP Repair software and install on your system
  • Run the application, select 7z archive by clicking 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 location where fixed 7-ZIP archive can be saved

Points to keep in mind:

  • Monitor your computer using good AV tool to avoid 7-ZIP archive corruption
  • Never download 7-ZIP archive in slow speed internet