sorry this is taking so long, but i will be posting a new version tonight which fixes the wav issue. (was a silly programming error
but anyway, the durations of wav files (as with others) are not determined by tags but gathered from the audio component used to read these files. there will be no name or year tags of any sort embedded into a wav, so all you'll see is the filename, filesize, and a duration.
thanks for using (and hopefully enjoying) this software.