ExtractArchive fails on Windows due to long paths in archive
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Tom G
Nov 18, 2025, 4:03:42 PM (11 days ago) Nov 18
to innosetup
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.
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.
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