Cannot open. aup project

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

How, exactly, did you do that?
Did you:

  1. Launch Audacity
  2. “File menu > Open” and select the project file.

That’s a strange path. Are you sure that is correct?