FileFormat Graphics Tileset
From OPU Wiki
Outpost 2 Tile Set file format
Note: This refers to the "well00??.bmp" files found in maps.vol.
Note: Tile sets must be in either 1 bpp, 8 bpp, or 16 bpp color modes. Other formats
cause the load to be aborted. (16 bpp causes a crash, probably 1 bpp too.)
Note: The tile set files can be replaced by standard bitmap files.
Note: The bitmap data should contain a column of all tiles.
