There is only one file type that uses the .WPROJ extension:
Wwise Project File
Project file created by Wwise, a program used for creating interactive audio for video games; saves sound settings and references to imported audio files; allows the sound engineer team to develop and organize sounds during game development.
WPROJ files are saved in an XML format. They are saved with several other directories and files that store audio assets and audio settings.
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Updated: March 9, 2012