Windows Media Encoder
Install the above applications.
Using DVD Decrypter extract the DTS stream

Load the Transcode GUI and browse for DTS file e.g. VTS_01_1 - 0x89 - Audio - DTS - 5ch - 48kHz - DRC - DELAY -170ms.DTS
Output folder will be automatically filled.
Choose 6 Mono Wav
Click Run
In the output folder your should see six Wave files e.g:
VTS_01_1 - 0x89 - Audio - DTS - 5ch - 48kHz - DRC - DELAY -170ms-C.wav
VTS_01_1 - 0x89 - Audio - DTS - 5ch - 48kHz - DRC - DELAY -170ms-FL.wav
VTS_01_1 - 0x89 - Audio - DTS - 5ch - 48kHz - DRC - DELAY -170ms-FR.wav
VTS_01_1 - 0x89 - Audio - DTS - 5ch - 48kHz - DRC - DELAY -170ms-LFE.wav
VTS_01_1 - 0x89 - Audio - DTS - 5ch - 48kHz - DRC - DELAY -170ms-SL.wav
VTS_01_1 - 0x89 - Audio - DTS - 5ch - 48kHz - DRC - DELAY -170ms-SR.wav
Please follow the relevant instructions in the converting to WMV9 guide.