Corrupt Projects + WAV's

Hi all,

I noticed that some projects of mine that I backed up won’t open anymore, and can’t even open/listen to the WAV files in the audio folder. Has anyone ever come across this issue? I did back them up to an HFS+ harddrive on my windows PC with software so it could read HFS+, but I did the same with all other projects that work fine.

Any help is welcome,