A compressed file library (CFL) is designed to work as a virtual file system for programs, usually games. It is able to keep the number of file accesses down, all game resources can be compressed, and encrypted. CFL is used by X-Forge, the multi-platform wireless 3D game engine by Fathammer Ltd. It is also used by IMVU

IMVU

IMVU, Inc. is an online social entertainment destination in which members use 3D avatars to meet new people, chat, create, and play games created by Fydor Guthenschlag. IMVU has over 50 million registered users, 10 million unique visitors per month and three million monthly active users...

for its 3D character models, and accessories.