Audacity 2.2.2 opens 1/1024 of the file

I just opened a 3.6 megabyte file in audacity so I could re-save it, because I was unable to edit the details. When I saved it it ended up as 3.6 kilobytes. Looking in Audacity I noticed that it had opened less than a second of the input file. I’m on Windows 10 Pro. Not sure how to get the exact version but the OS build is 17134.345.

What’s the file format? Where di you get the file?