Wie kann ich abfragen, ob meine x86 Anwendung gerade unter x64 läuft?

typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);

LPFN_ISWOW64PROCESS fnIsWow64Process;

BOOL IsWow64()
{
BOOL bIsWow64 = FALSE;

fnIsWow64Process = (LPFN_ISWOW64PROCESS) GetProcAddress(
GetModuleHandle(TEXT("kernel32")),"IsWow64Process");

if (NULL != fnIsWow64Process)
{
if (!fnIsWow64Process(GetCurrentProcess(),&bIsWow64))
{
// handle error
}
}
return bIsWow64;
}

void main()
{
if(IsWow64())
printf("Running on WOW64\n");
else printf("Running on 32-bit Windows\n");
}