I've done it with games many times. Well, disassembling rather than decompilation, but close enough.
For example, changing hardcoded key bindings to be more dvorak friendly in Touhou games.
I've fixed many Quake engine based games that have the infamous OpenGL extension string overflow bug.
There's another old game (possibly Soldier of Fortune 2: Double Helix?) that refuses to run if you have the string "generic" in your OpenGL driver name. This is common on Linux distros that ship a "generic" kernel.
Painkiller crashes if your uptime is too high, due to overflow on division. That's another easy fix.
For example, changing hardcoded key bindings to be more dvorak friendly in Touhou games.
I've fixed many Quake engine based games that have the infamous OpenGL extension string overflow bug.
There's another old game (possibly Soldier of Fortune 2: Double Helix?) that refuses to run if you have the string "generic" in your OpenGL driver name. This is common on Linux distros that ship a "generic" kernel.
Painkiller crashes if your uptime is too high, due to overflow on division. That's another easy fix.