How can I query whether my x86 application is currently running on x64?

IsWow64Process abfrage unter x64 MS OS nach ob die exe im WOW64 Modus arbeitet!

1.) ... Query whether the x86 application runs under x64!
2.) ... Advantages and disadvantages of querying whether the x86 application runs under x64!

1.) Query whether the x86 application runs under x64!

#include <Windows.h>
#include <stdio.h>
 
// Define a function pointer type
// LPFN_ISWOW64PROCESS for IsWow64Process
 
typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS)(HANDLE, PBOOL);
 
 
// Function pointer for IsWow64Process
 
LPFN_ISWOW64PROCESS fnIsWow64Process;
 
// Function to check if the current
// process is running on a 64-bit Windows system
 
BOOL IsWow64() {
BOOL bIsWow64 = FALSE;
 
 // Get the address of the IsWow64Process function from kernel32.dll
 
fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(
  GetModuleHandle(TEXT("kernel32")), "IsWow64Process");
 
 if (fnIsWow64Process != NULL)
{
  // Call the IsWow64Process function
  // to check if the current process
  // is running as a 32-bit process on a 64-bit system
 
 if (!fnIsWow64Process(GetCurrentProcess(), &bIsWow64))
 {
   // Handle an error here if needed
 }
 
 }
 return bIsWow64;
}
 
int main()
{
 if (IsWow64())
 {
  // Running on a 32-bit process on a 64-bit system
 
  printf("Running on WOW64\n");
 }
 else
 {
  // Running on a 32-bit system
 
  printf("Running on 32-bit Windows\n");
 }
 return 0;
}

2.) Advantages and disadvantages of querying whether the x86 application runs under x64!