DTS—a lossily compressed multichannel format—is shoehorned into uncompressed stereo PCM (which is not WAV, by the way) so that it can be written to an audio CD. Contrast this with native DTS as written to DVD-Video muxed into MPEG2 video, with discrete channels. When played back through a DTS decoder, the same stream as written to either format will sound the same, but the data are written and stored quite differently.
It is possible to demux DTS from MPEG2, but the resulting file isn't a consumer standard. Furthermore, there is currently no way to convert DTS-CD to native DTS. So, I propose that: 1) a DTS filetype standard should exist, and 2) there should be a method to arrive at this filetype regardless of the storage medium from which the stream originated.