This program fixes an issue with Zip files larger than 4 Gig created by OneDrive and also the Windows 10 right-click action Send-To/Compressed (zip) folder. At the time of writing these Zip files cannot be unzipped using some of the well-know Zip archivers.

For a really detailed summary of the issue, see Does Microsoft OneDrive export large ZIP files that are corrupt?.

This program automates the manual process described in the referenced page.

Notes

1. This program will modify your Zip file, so it is good practice to take a backup copy of the original file just in case.

2. You need a 64-bit build of perl to run this program.

perl fix-onedrive-zip [--dry-run] file1.zip [file2.zip...]

The --dry-run option will simulate running of the program without making any changes to the Zip file.

If you want to understand more about the internal structuire of Zip files, the primary reference is APPNOTE.TXT.

The issue with the OneNote/Windows Zip files larger than 4 Gig is they have an invalid Total Number of Disks field in the ZIP64 End Central Directory Locator record (see APPNOTE.TXT version 6.3.9, section 4.3.15). The value in this field should be 1, but OneDrive/Windows sets it to 0.

This program simply changes the Total Number of Disks field value to 1 if it finds it set to 0 in the Zip file.

https://github.com/pmqs/Fix-OneDrive-Zip/issues

Copyright (c) 2020-2022 Paul Marquess ([email protected]). All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.