More thoughts:
- this only seems to affect Zip files made “by code” - e.g. using ZipMBS. I don’t know if other Zip libraries are affected.
- Finder Zip (right-click, “Compress My App”) always works in both directions (compress on Catalina, works on Mojave, and vice versa)
- My app is cross-platform (e.g. the Windows side can zip up a mac app) so this is a big problem for me. I’m pretty sure I can’t build a DMG on Windows.
- How does Xojo do it? (I purely run Xojo IDE on mac). If you build a Mac app on Xojo under Windows, does it build a Zip file? If so, is that now broken too?