USB-SPDIF converter problem: no DTS and Dolby signal

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Joined: 12 Aug 2008
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I purchased an USB-SPDIF converter together with a software: intervideo windvd 4.0

The converter is able to transfer digital audio signal without using any soundcard from USB port to the HT receiver using a coaxial connection.

When I play dvd with the software windvd 4.0 both dolby digital and dts signals are transfered to the receiver.
But this program is not able to play mkv files so I use Mediaplayer Classic HT version, together with ac3filter, fddshow, matroska media splitter, vsfilter...

The problem is that I am not able to transfer dolby and dts signal to the receiver with these programs. I marked SPDIF in ac3 filter but only stereo signal goes to the receiver.
I tried the audio codec of powerdvd also but no result.

The USB-SPDIF converter uses a driver in the windows called “USB audio device”. I suppose that the problem is with this driver, how can I find new driver for this device? (no driver included by the manufacturer)