I have a problem then compiling my "How to play a file"-project. The code is from MSDN and it won't work at all. The following result came from the compiler: LNK2001: unresolved external symbol _IID_IGraphBuilder LNK2001: unresolved external symbol _CLSID_FilterGraph LNK2001: unresolved external symbol _IID_IMediaControl LNK2001: unresolved external symbol _IID_IMediaEvent Can someone please tell me what the problem is.

try adding dxguid.lib to your librarys.

the problem is fix. I added the files: quartz.lib strmiids.lib. So now it works fine!