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

#include
#include

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");
}