I saved a project I have being working on for weeks now. Saving and opening later has being a regular routine until I tried opening the project and I get an error message
“C: \users\Documents\Audacity\workspace\project.aup” is an Audacity Project file. Use the ‘File>Open’ command to open audacity Projects.
I use audacity 2.2.2 on a windows 8.1 os