Removing the "black bars" and expanding Mario’s world to fit modern monitors.
How to remap controls? · Issue #224 · sm64pc/sm64ex - GitHub sm64config.txt
The sm64config.txt file is a configuration script used by various PC ports of Super Mario 64 . Unlike the original ROM which had fixed settings, the PC port allows for deep customization. When you launch the game, it reads this file to determine how it should look and behave. Removing the "black bars" and expanding Mario’s world
How do I reset controls to default? · Issue #471 · sm64pc/sm64ex sm64config.txt