There is only one file type that uses the .P2G extension:
Power2Go Project File
Disc image project created by Power2Go, a disc authoring and burning application; saved in an XML format and stores CD, DVD, or Blu-ray disc project settings; used for authoring audio, video, data, or mixed mode discs.
P2G files allow users to save project settings and edit the disc project at a later time. They can be used for generating disc images in the proprietary .P2I format or in the standard .ISO format.
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Updated: June 6, 2011