Bug 506685

Summary: Ark fails to extract files from ZIP archives that are packed with the "Deflate64" method. "Compression method not supported"
Product: [Applications] ark Reporter: Holmes <social.calamari468>
Component: generalAssignee: Elvis Angelaccio <elvis.angelaccio>
Status: RESOLVED DUPLICATE    
Severity: grave CC: rthomsen6
Priority: NOR    
Version First Reported In: 25.04.3   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Holmes 2025-07-06 18:10:00 UTC 
SUMMARY
When opening a .zip archive in Ark, extracting a file that has the compression method "Deflate64" will fail with the error message: "Compression method is not supported". Files from the same .zip archive that have different methods such as "Store" will extract without problems.

This problem only affects Ark. Using the "unzip" command will extract all files from the same archive without problems.

STEPS TO REPRODUCE
1. Have a .zip archive with files that have mixed compression methods. For example "Deflate64" and "Store".
2. Try to extract the file packed with "Deflate64". It will fail.
3. Try to extract the file packed with "Store". It will work.

OBSERVED RESULT
Files with "Deflate64" always fail to extract in Ark. They dont fail with the terminal "unzip" command.

EXPECTED RESULT
Files should extract regardless of the compression method.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.4-zen2-1-zen (64-bit)
Graphics Platform: Wayland
Comment 1 2wxsy58236r3 2025-08-14 08:12:31 UTC 
You can disable libzip plugin in Ark's settings and let Ark use 7z or Info-zip plugin instead, since libzip does not support Deflate64 (see also: https://bugs.kde.org/show_bug.cgi?id=476922#c4).

*** This bug has been marked as a duplicate of bug 441608 ***