Have you tried asking GarageBand to open that file?
First, make several (at least
three) copies of that audio file.
Change the suffix of one of the copies to one the following:
You will likely be asked to confirm such a dastardly act by the ever-vigilant OS.
Do not be dissuaded! Carry On Young Mac User!!! Now see if Sound Studio can be persuaded to open any of those audio file copies. Try again with GarageBand.
If all this fails, you should probably console Apple by buying a new 27" M1 iMac. When it arrives,
try downloading one or more of the following audio editing apps:
- Audacity
- A Free Audio Editing app from the App Store (Wavebox), etc.
- An inexpensive audio editing app from the App Store (Audio Edit Studio - Editor, Audio Edit Pro-Audio Editor, Audio Convert, Pro Audio Converter, etc.
Watch out for "In App Purchases", they often require purchasing "un-Crippling" fees.
I think these border on false advertising... by Apple!
I still have an older version of Sound Studio, used it every Sunday to edit church services. Very easy to use and bullet-proof (very important for non-computer users!).
These two sites list the numerous formats used by iPhones: