Convert DTS to WAV?

I have a DTS audio file that I demuxed from an MKV movie. But now I need to convert it to WAV or AC3 before I process the movie and then remux the audio. I tried BeSweet, which should have done what I want. But it doesn’t work. BeSweet chokes on the iviaudio.ax filter installed by WinDVD. Even after I copied the filter to Windows\System32 and ran regsvr32 to install it, BeSweet couldn’t find it.

Any ideas how I can convert this DTS audio file to either WAV or AC3?

Thanks for any help.

Using Foobar2000 guide on Doom9