I never use RAW, but the emails I get suggest that it now supports numerous RAW formats.
As per
http://www.cerious.com,
ThumbsPlus Pro Edition supports raw and professional camera file formats (Digicam Plug-in required):
* .CRW (Canon raw format)
* .CR2 (Canon raw format)
* .NEF (Nikon raw format)
* .MRW (Minolta raw format)
* .DCS (Kodak professional camera)
* .DCR (Kodak professional camera)
* .ORF (Olympus raw format)
* .MDC (Minolta format)