SPDIF error

When i set AC3Filter to use SPDIF and configure BSPlayer to use the SPDIF out of my soundcard, my receiver tells the sound is PCM.

I here very high tones (AC3 stream) but the receiver doesn't recognize it.

Also tried different versions of iviaudio.ax and they only support stereo output.

I use Windows 2000 and a Terratec EWX 24/96 soundcard (Envy24 chipset)

When i remove all WinDVD and PowerDVD .ax files i here nothing.

Can somebody help?