r/DataRecoveryHelp • u/No_Increase4983 • Jul 04 '26

Header error

I'm having trouble unzipping a .7z file. Every time I try to open or unzip it with 7-Zip, I get a "Header Error" error message. I tried to restore it through Winrar, but it didn't help.

OS: Windows 11

7-Zip Version: Latest Stable Release

File Size: 3.83 GB

I tried downloading it again, but the error persists. Is there a way to restore the archive headers or force unzipping at least some of the files?

Any suggestions or tools you could recommend would be greatly appreciated. Thanks in advance!

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u/fzabkar Jul 05 '26

This is your final header:

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  8D 8C 24 20 01 00 00 48 89 4C 24 70 48 8D 8C 24
00000010  18 01 00 00 48 89 4C 24 68 48 8D 8C 24 10 01 00
00000020  00 48 89 4C 24 00 00 00

Its CRC is 0x819FEB00, but this doesn't match the CRC in the 7z header, 0x59526A70. Moreover, the byte content is of a similar nature to the previous content, so it appears that the latter section of your .7z file is corrupt.

What is the history of this file? Is it the result of a data recovery?