I have read that some file types can be repaired
Some times repair is an option if a file is only
partially encrypted. Repair then entails getting rid of encrypted data and make remaining non encrypted data viewable, playable etc.. If encrypted entirely, decryption is only option.
Example, here it turned out GlobeImposter does not encrypt entire file:
https://youtu.be/rB5vo02SjD8.
Here PayFast or Zeppelin does not encrypt entire file:
https://youtu.be/0gAhaAKshYwOr STOP DJVU:
https://youtu.be/ouSTB6Rg10gI have no idea about Fargo though, never encountered it.
It does of course depend on type of data if repair is feasible and even desirable.
Quick hint could be to look at file entropy: IF entropy 8.00 bits/byte likely entire file is encrypted.