There is only one file type that uses the .VPJ extension:
VideoPad Video Editor Project File
Project file saved by VideoPad Video Editor, an application used for creating digital videos; stores references to video files and can include transitions, effects, and audio; used for saving the user's editing progress.
VideoPad Video Editor projects support several input video formats. The software can also export VPJ files to CDs, DVDs, and Blu-ray discs, as well as .AVI, .WMV, .MPG, .MOV, .3GP, YouTube, and other formats.
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Updated: February 1, 2011