There is only one file type that uses the .WGS extension:
Walk-Graph Segment File
Image file used by RichFX online merchandising programs such as Rich Catalog, Zoom, Color Change, Rotate, and Design; can also be viewed with the RichFX RealPlayer plugin.
NOTE: RichFX was acquired by ChannelAdvisor, who now offers RichFX products such as RichImage, RichCatalog, and RichCircular. WGS files are rarely seen anymore.
Updated: January 19, 2010