This is a rubble terrain tile meant to replace “ground rocky red.bmp” in CMBN, or any of CMX2 series game, after renaming the BMP to your needs.
The file was made from original BFC rubble tile (ground rubble.bmp) and fits best with red brick/masonry buildings and environments (see screenshot). CMFI and other buildings need obviously another mod to fit Also the mod was made with damp ground/weather conditions in mind. Dry and dusty conditions likely need a ligthtened up version.
Unzip the BMP into Data/Z folder as usual. If the rubble tile does not show up in the game, then there´s possibly another “ground rocky red.bmp” taking precedence. From a terrain mod package BRZ file maybe.