Ac3 encoded video, SPDIF but my receiver switches to ste

Hi all,
I've got this problem, I got a video witch says to have ac3 encoded audio. Once tested with Gspot codec information that seemed to be true. When I run the video an icon appears of Dolby digital bit stream out but my external receiver switches to digital stereo in stead of switching to 5. surround sound witch the receiver normally does when I run ac3 encoded files....
All the settings are set to SPDIF pass trough. Other ac3 encoded files give no problem, perfect 5. surround sound...
So whats wrong here... Is the video file a faker or what
Greetings and thanks in advance, Thomas Voortman

It says the following:
Audio:
Bit rate: 224 kbps
Audio format: AC-3 ACM decompressor
Off course it gives more info, but i guess that isn't necessary?
I already checked this summary but didn't knew how to change this settings. I guess that the audio format is the prob? Is it possible to change it's
Thanks in advance.
Greatings, Thomas Voortman

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