Be cautious if you find a .trg extension appended to your personal files (e.g., photo.jpg.trg ). This indicates a infection.
Some emulators, like RetroArch , can read games directly from a .7z file. TRG.7z
For emulators like PCSX2 , you must extract the file first to get the .iso or .bin disc image. Be cautious if you find a