Blizzard Entertainment:Storm
"Blizzard games released since 1996 to 2004 (Diablo, Diablo II, Starcraft, Warcraft II and Warcraft III) shipped with Storm.dll, a dynamic library that contained functions that were able to read data from the archives. This DLL also contained memory management functions, network support, compression functions and other. There was also a Mac version of this library, named Storm.bin. Storm.dll only contained functions for reading MPQs. The MPQ writing functions (saving games, creating maps etc.) were compiled inside the main game executable."
The Storm library is used extensively throughout WoW