Ratatouille extractor
The game files are unpacked in this browser and stay on this device.
Your own discs
Choose the images of both PC discs (RAT1.iso and RAT2.iso).
Own the game but don't have the disc images on hand?
The Internet Archive keeps Redump's images of the European two-disc PC edition. If you own the game, this browser can download them from there itself (1.6 GB) and unpack them; nothing comes from this site.
Play the game from these files.