The filename typically refers to a compressed segment of a large software or game repack, most likely associated with Grand Theft Auto: Half-Life Mod (GTHM) distributed by the repacker DODI [1, 2].
: Generally stands for Grand Theft Auto: Half-Life Mod , a popular total conversion mod. GTHMDODI2GB.part01.rar
To understand the file, we have to decode the shorthand used by its creators: The filename typically refers to a compressed segment