playing old project files

Hi, I have lots of old AU project files on my PC from a while back from recordings some years ago. They won’t play - a ‘can’t find project file’ window pops up. What should I check?

Thanks Rick

For an Audacity project, you need the “.AUP” project file, and the project’s “_data” folder
(See: Managing Audacity Projects - Audacity Manual)

Do you have the AUP file and _data folder for each of the projects?