I have never had a need to do this from VFP so I don't a VFP specific example, however I can say that you need to use more than just the UpdateResource() function as you will see from the following C/C++ code:-

HRSRC hResLoad;     // Handle to loaded resource.
HANDLE hExe;        // Handle to source .EXE file. 
HRSRC hRes;         // Handle to res. info. in hExe.
HANDLE hUpdateRes;  // Update resource handle. 
char *lpResLock;    // Pointer to resource data.
BOOL result; 
 
   // Load the .EXE file that contains the dialog box 
   // you want to copy. 
   hExe = LoadLibrary("source.exe"); 
 
   if (hExe == NULL) 
      ErrorHandler("Could not load the source EXE."); 
 
   // Locate the dialog box resource in the .EXE file. 
   hRes = FindResource(hExe, "SampleDialog", RT_DIALOG); 
 
   if (hRes == NULL) 
      ErrorHandler("Could not locate the SampleDialog resource."); 
 
   // Load the dialog box into global memory. 
   hResLoad = LoadResource(hExe, hRes); 
 
   if (hResLoad == NULL) 
      ErrorHandler("Could not load the SampleDialog resource."); 
 
   lpResLock = LockResource(hResLoad); 
 
   if (lpResLock == NULL) 
      ErrorHandler("Could not lock resource memory."); 
 
   // Open the destination file to which we add the resource.
   hUpdateRes = BeginUpdateResource("destination.exe", FALSE); 
 
   if (hUpdateRes == NULL) 
      ErrorHandler("Could not open destination file for writing."); 
 
   // Add the dialog box resource to the update list. 
   result = UpdateResource(hUpdateRes,           // Update resource handle.
      RT_DIALOG,                                 // Change dialog box resource. 
     "AboutBox",                                 // Dialog box name. 
     MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),  // Neutral language.
     lpResLock,                                  // Pointer to resource info.
     SizeofResource(hExe, hRes));                // Size of resource info. 
 
   if (result == FALSE) 
      ErrorHandler("Could not add resource to the update list."); 
 
   // Write changes and close destination EXE. 
   if (!EndUpdateResource(hUpdateRes, FALSE)) 
      ErrorHandler("Could not write changes to destination EXE."); 
 
   if (!FreeLibrary(hExe)) 
      ErrorHandler("Could not free executable."); 
} 

This is source originally taken from sn MSDN example but as you can see its quite involved.

HTH
Neil