Audacity won't open project file saying it does not recognize the type of the file

I have a project file called “impaler full”. I have the project file and the project folder “impaler full_data” with all the data in it. However, when I try to open the file, audacity says “Error Importing” and it does not recognize the file and suggests to download FFmpeg. Any assistance is greatly appreciated.

The AUP file may be corrupt. Please attach it to your reply (just the AUP file) and I’ll check it.
See here for how to attach a file: