MPEG2 video files do not show thumbnails in Background Improv
Applicable SongShow Plus Versions:
This article applies to SongShow Plus Version 7 running on Windows Vista.
The display of MPEG2 thumbnails appears to be a limitation of the operating system rather that SongShow Plus itself. In Windows Explorer the files are simply displayed as an icon when thumbnail view is selected.
Microsoft has specifically acknowledged this behavior in Windows Vista, however there is no documentation addressing other operating systems.