aygshell.dll missing on target device

I'm developing a MP3 player for Windows CE using Compact Framework, but my target device does not contains aygshell.dll which, in turn, contains the SndPlaySync function I want to use.
Looking here I downloaded a ZIP contains some of this DLL, but neither of them export this function!
Where can I found the ORIGINAL DLL?
Regards,
Daniele.

Aygshell.dll can be included in a Windows CE 5-6/Windows Embedded Compact 7 OS image but, IIRC, it is not included in the core OS license that is what most of devices carry. If you can modify the image and its licensing, then you can add the DLL to your OS image by just selecting the aygshell component from the OS catalog.
The Windows CE version does not provided 100% of the features supported by the Windows Mobile one, it was originally provided to improve the app compatibility between the two OS.