How do I call a function in winmm.dll from inside a standard windows form application?

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C++

I have a standard Windows Form Application compiled witb /clr:pure switches. I am trying to call functions inside WinMM.dll. I beleive that the proper h file is "C:\Program Files (x86)\Microsoft Visual Studio 8\SDK\v2.0\include\MMSystem.h". The h file does exist and can be opened by depends.exe.

The basic program compiles fine until I add support for calling DLL functions.

What I have tried:

I have googled, bing, and yahooed this question (and a score of simlar ones) 'till my eyes glazed over.
I have tried:
#include <mmsystem.h> ------------------- 88 errors

#include <mmsystem> fatal error C1083: Cannot open include file: 'MMSystem': No such file or directory	

#import <mmsystem> error C2812: #import is not supported with /clr:pure and /clr:safe	

#using <C:\Program Files (x86)\Microsoft Visual Studio 8\SDK\v2.0\include\MMSystem.h> error C1192: #using failed on 'C:\Program Files (x86)\Microsoft Visual Studio 8\SDK\v2.0\include\MMSystem.h'