The Fallout source code refers to the code used to compile the original game's executables and those of its sequel, Fallout 2. Due to Interplay Entertainment's policy at the time, all the original assets used to create the game, as well as the source code necessary to port the original games to new platforms, were meant to be destroyed upon Tim Cain's departure from the company. However, Rebecca Heineman revealed in May 2025 that she archived a copy of the source code that was used to create a port of Fallout for Mac.[1]
Fallout Wiki