MBM (file format)

MBM (an abbreviation of Multibitmap) is a file format that is a collection of bitmap images (which is why the file format has that name). The images are not stored the same. Instead, the images are stored with a modified bitmap header with no compression or 8-bit, 12-bit, 16-bit or 24-bit RLE compression.
MBM files are used by most Symbian GUI applications to store graphics.