ExtractArchive fails on Windows due to long paths in archive

[Tom G]

Hello,

I found a problem where ExtractArchive fails on Windows when the total path becomes too long.

The problem happens because:

1. The .7z archive I use itself has a complex structure with many folders, subfolders, and long filenames.
2. When I extract it to a target folder that is also long, the full path (target folder + archive's internal paths) exceeds the Windows limit.

This causes the error:
ERROR: Function Extract returned error code -2147467259

However, when I use an external 7za.exe from the command line on the same Windows machine, it extracts the same archive to the same long path without any problems.

[Martijn Laan]

Hi,

Op 18-11-2025 om 21:43 schreef Tom G:

I found a problem where ExtractArchive fails on Windows when the total path becomes too long.

Inno Setup 7, which is still a work in progress, will support long path names, called extended-length paths or super paths. This will make ExtractArchive work with your archive as well.

Greetings,
Martijn

[Tom G]

Thank you for your response.
Best,

Tom