Modding support

Like the original DOS executable, Rigel Engine supports replacing individual files from the game's data pack file (NUKEM2.CMP) with external files. For example, when a file called L1.MNI is found next to the .CMP file, it will be used instead of the version found inside the .CMP. This makes it possible to use existing patches and mods, like the sunglasses patch.

On top of this, Rigel Engine features enhanced modding support: Sprites, tile sets, backgrounds, sound effects, and music can be replaced. The game looks for replacement files in a folder called asset_replacements next to the .CMP file. For each file that's found in that folder, the game will load that file instead of the version in the original game data.

Type	Naming scheme	Supported formats	Notes
Tile sets	tileset<N>.png	PNG	<N> must match the (hexadecimal) number of the tileset to be replaced. E.g. tileset2.png to replace CZONE2.MNI