In extreme cases (e.g., a 600MB game shrunk to 50MB), the uploader may have "ripped" content out of the game.

Developed initially for MAME, this has become the gold standard for CD-based systems like the PS1. It converts multiple files (like .BIN and .CUE) into a single file that emulators can decompress "on the fly," meaning there is no performance lag during gameplay. KGB Archiver (The Extreme Legend):