RDR2 screenshots are stored in a weird format. This tool takes a path to your RDR2 profile folder,
converts all screenshots to JPGs, and puts them in screenshots/. The original versions are put in
screenshots_backup/ so you can recover them and upload them to the social club if you wish.
On Windows, the RDR2 profile folder is located at
C:\Users\{USERNAME}\Documents\Rockstar Games\Red Dead Redemption 2\Profiles\{random letters here}.
Each screenshot's filename starts with PRDR, and they're just JPGs with 300 extra bytes at the
start.