Short description of Prism Plus MPEG2 Video Converter 1.61: Prism is a video file converter for Windows. It can convert video files from avi, mpg, vob, wmv (Windows Media Video formats) and more into avi, asf or wmv files. Prism Video Converter is very easy to use. Just add the files you want to convert to the list, select the format you want to use, and then click the convert button.