[WM6] How to disable camera Shutter Sound ?

Hi,

I'm writing an application c++ which uses DirectShow api. When I snap a picture, I would like to disable the camera shutter sound.

I saw many Registry Keys in \HKLM\System\Pictures\Camera\OEM :

- ForceShutterSound

- ShutterSoundVolume

- SoundFile

But I can't find any documentation about these and I tried a lot of combination. Someone has any idea? Thanks a lot in advance!!

*Device : Motorola MC75, Windows Mobile 6.5

* OS version : CE 05.02.29040

*Platform : Windows Mobile 6 Sdk