Technical communities use this filename for specific hardware support:
It often indicates that a game ROM or ISO contains three languages (usually English, French, and German). You will see this in sets for consoles like the Sega Saturn or Amiga CD32 .
In the world of retrogaming and Internet Archive collections, "M3" is a common shorthand found in file titles. It generally serves one of two purposes:
In some specific game archives, it can denote the third disk or media part of a larger set. 🏎️ Automotive and Digital Assets
Data files that define how the car looks and handles in-game. 📱 Mobile Firmware and Software