Confusing errors with dxerr9.h

I'm using Visual C++ .net 2003 and just tried to use the DXGetErrorString9() function from dxerr9.h/dxerr9.lib and the compiler spat out 100 error messages followed by "c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(8262): fatal error C1003: error count exceeds 100; stopping compilation ". My program compiled fine until I added two lines to it to include and link the dxerr9 files (#include , #pragma comment(lib, "dxerr9.lib")). The first two errors I get are from the file dxerr9.h:

HRESULT WINAPI DXTraceA( const char* strFile, DWORD dwLine, HRESULT hr, const char* strMsg, BOOL bPopMsgBox );
HRESULT WINAPI DXTraceW( const char* strFile, DWORD dwLine, HRESULT hr, const WCHAR* strMsg, BOOL bPopMsgBox );

Game error C2040: 'WINAPI' : 'int' differs in levels of indirection from 'const char *'
Game error C2040: 'WINAPI' : 'int' differs in levels of indirection from 'const char *'

My best guess from that and skimming through some of the other errors is that theres a problem with 'WCHAR'. Anyone have any ideas? Thanks!