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MPQ (short for "MoPaQ", supposedly derived from Mike O'Brien Pack) is the name of a file extension and type of proprietary data file used by World of Warcraft through the Mists of Pandaria expansion; although it is used in various other games by Blizzard Entertainment.
With the Warlords of Draenor expansion, Blizzard has transitioned to a new proprietary format called CASC (Content Addressable Storage Container).
- MPQ article on Wikipedia
- MoPaQ archive format at Zezula.net
- libmpq - Open source MPQ manipulation library