LMS does not recognize .WAV files

Running LMS 7.8.0 on a Windows 7 box, which is primarily a file server. I use iTunes 11.1.5 on a mac to manage the music.

If I take a .wav file and copy it into iTunes, LMS does not recognize the file. If I convert that file to either ALAC or AIFF, LMS will recognize the file.

Am I missing a setting somewhere?

Thanks.