Common digital video format standardized by the Moving Picture Experts Group (MPEG); typically incorporates MPEG-1 or MPEG-2 audio and video compression; often used for creating movies that are distributed on the Internet.
Program(s) that open mpg files
Mac: Apple QuickTime Player; Apple iTunes; Microsoft Windows Media Player; Roxio Toast; Roxio Popcorn; Other movie player Windows: Apple QuickTime Player; Apple iTunes; Microsoft Windows Media Player; Roxio Creator; CyberLink PowerDirector; CyberLink PowerDVD; Other movie player
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/mpg
