'System.BadImageFormatException' occurred

Question

Hey everyone. I'm hoping you can help me. Currently I am developing a media player using MCI and C#. The project has been worked on on XP 32 bit, Vista 32 bit and Visa 64 bit. It works fine on the 32 bit systems, however when I try to load the media file on the 64 bit computer I get an unhandled exception. It was:

An unhandled exception of type 'System.BadImageFormatException' occurred

Additional information:  is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)

Please help me fix this problems. Its being developed using VS 2008. Thank you.