How to locate the correct path to the Mapisvc.inf file in Microsoft Outlook

typedef BOOL (STDAPICALLTYPE FGETCOMPONENTPATH)
(LPSTR szComponent,
 LPSTR szQualifier,
 LPSTR szDllPath,
 DWORD cchBufferSize,
 BOOL fInstall);
typedef FGETCOMPONENTPATH FAR * LPFGETCOMPONENTPATH;    

/////////////////////////////////////////////////////////////////////////////// 
// Function name    : InitMAPIDir
// Description      : For Outlook 2000 compliance. This will get the correct path to the
//                  : MAPISVC.INF file.
// Return type      : void 
// Argument         : LPSTR szMAPIDir - Buffer to hold the path to the MAPISVC file.
//                  : ULONG cchINIFileName - size of szMAPIDir
void InitMAPIDir(LPSTR szINIFileName, ULONG cchINIFileName)
{
    UINT uiRet = 0;
    CHAR szSystemDir[MAX_PATH+1] = {0};

    // Get the system directory path
    // (mapistub.dll and mapi32.dll reside here)
    uiRet = GetSystemDirectoryA(szSystemDir, MAX_PATH);
    if(uiRet > 0)
    {
        HRESULT hRes = S_OK;
        CHAR szDLLPath[MAX_PATH+1] = {0};

        hRes = StringCchPrintfA(szDLLPath, MAX_PATH+1, "%s\\%s", 
            szSystemDir, "mapistub.dll");
        if(SUCCEEDED(hRes))
        {
            LPFGETCOMPONENTPATH pfnFGetComponentPath = NULL;

            HMODULE hmodStub = 0;
            HMODULE hmodMapi32 = 0;

            // Load mapistub.dll
            hmodStub = LoadLibraryA(szDLLPath);
            if(hmodStub)
            {   
                // Get the address of FGetComponentPath from the mapistub
                pfnFGetComponentPath = (LPFGETCOMPONENTPATH)GetProcAddress(
                    hmodStub, "FGetComponentPath");
            }

            // If we didn't get the address of FGetComponentPath
            // try mapi32.dll
            if(!pfnFGetComponentPath)
            {
                hRes = StringCchPrintfA(szDLLPath, MAX_PATH+1, "%s\\%s", 
                    szSystemDir, "mapi32.dll");
                if(SUCCEEDED(hRes))
                {
                    // Load mapi32.dll
                    hmodMapi32 = LoadLibraryA(szDLLPath);
                    if(hmodMapi32)
                    {
                        // Get the address of FGetComponentPath from mapi32
                        pfnFGetComponentPath = (LPFGETCOMPONENTPATH)GetProcAddress(
                            hmodMapi32, "FGetComponentPath");
                    }
                }
            }

            BOOL bRet = FALSE;

            if(pfnFGetComponentPath)
            {
                // Now that we have the address of FGetComponentPath
                // Let's call it with the GUID for mapisvc.inf
                bRet = pfnFGetComponentPath(
                    "{473FF9A0-D659-11D1-A4B2-006008AF820E}",
                    NULL, szINIFileName, cchINIFileName, TRUE); 
            }

            // If FGetComponentPath returns FALSE or if
            // it returned nothing, or if we never found an
            // address of FGetComponentPath, then
            // just default to the system directory
            if(!bRet || szINIFileName[0] == '\0')
            {
                hRes = StringCchPrintfA(szINIFileName, cchINIFileName,
                    "%s\\%s", szSystemDir, "mapisvc.inf");
            }

            if(hmodMapi32)
                FreeLibrary(hmodMapi32);

            if(hmodStub)
                FreeLibrary(hmodStub);
        }
    }
}