StormLib is a pack of C++ modules, which provide the user means to modify MPQ
archives

MPQ (MoPaQ) is an archive format developed by Blizzard Entertainment, purposed
for storing data files, images, sounds, music and videos for their games. The
name MoPaQ comes from the author of the format, Mike O'Brien (Mike O'brien
PaCK).

WWW: http://www.zezula.net/en/mpq/main.html