Raw format of the Minolta RD-175 digital cameras. The Minolta Raw format is simply pixel data as it comes directly off the CCD, no in-camera processing is performed. Typically this data is 8, 10 or 12 bits per pixel. The advantage being that file sizes are considerably smaller than an equivalent TIFF file. The image has not been processed or white balanced which means you can correct the image, and it's a better representation of the "digital negative" captured.
NOTE: This file format requires the DigiCam plug-in, only available in the professional edition of ThumbsPlus.