A .vpd file is a PhotoDVD Project File. PhotoDVD is a software application developed by VSO Software. It allows you to create clever slideshows out of a variety of different image files.
To load this project file, click File --> Open Project. Please remember the files that are part of the project (all the pictures or background audio) must be in the same folders they were when the file was saved. Therefore, if you got this file alone from a P2P network or something, it is most likely useless to you.
Related software tools
VSO PhotoDVD (Shareware)
VSO PhotoDVD is probably one of the easiest program to create an animated slideshow of your digital pictures to watch them on a regular home DVD player.