I also tested on Windows, I wonder if @notimaginative might be able to test on Linux or Mac?

I'll give it a test as soon as I get the chance. Might be a few days though.

I'll give it a test as soon as I get the chance. Might be a few days though.

im particulary worried about appimage, it might not be able to see the folder.

Ok since the change was merged in FSO, i changed the minimal FSO version for the custom preferences path support to 24.3.0-20241211, so current nightly should work correctly with the custom FSO preferences path set inside the "kn_portable" folder.

The appimage worked without issue. The Mac app requires code changes since the binary directory and the application directory aren't the same with a Mac bundle.

I need to clean up my Mac test code and make a utility function for it (same path finding code is used for updates), then I'll post a diff of the needed modifications.

I should also add that for these tests I'm simply creating a kn_portable directory in the same location as the app. If there is more to it than that let me know and I'll run the tests again.

that should be fine.
The only detail is that current FSO nightlies should be able to save preferences inside
'\kn_portable\HardLightProductions\FreeSpaceOpen'

So as long as GetFSODataFolderPath() returns an absolute path, it should be fine.

Should i merge this and you PR the changes later or i should wait?

Here's the diff. Feel free to change that any way you like if there is better method to get the same result.

pr250-Mac_fix.patch

I got stuck trying to debug a crash-on-exit with the Mac build, but that happens on main as well so it's not an issue with this PR. VSCode is jerking me around with installed dotnet versions and other nonsense and I haven't had the time/energy to sort that out and debug the crash.