Compressed .gcf files (Game Cache Files) used by the GoldSrc engine.
In many gaming circles, hfl is shorthand for Half-Life , the game that redefined the first-person shooter. Archives with this name are frequently found on sites like the Internet Archive , containing: hfl.7z
Original "WON" versions of Half-Life (v1.1.1.0) that don't require Steam to run. Compressed