There is only one file type that uses the .VIFF extension:
Visualization Image File Format
Image file used by VisiQuest Khoros, an software development kit (SDK) used to develop imaging software and other visualization tools; stores a bitmap image using color "bands;" may optionally store one or more color maps.
VIFF images are used by scientific and research applications for visual data analysis.
NOTE: VisiQuest is now owned by AccuSoft.
Updated: October 28, 2010