OLE(Object Linking and Embedding)?

#include <windows.h>
#include <stdio.h>
#include <strsafe.h>
 
//*************************************************************
//
//  RegDelnodeRecurse()
//
//  Purpose:    Deletes a registry key and all its subkeys / values.
//
//  Parameters: hKeyRoot    -   Root key
//              lpSubKey    -   SubKey to delete
//
//  Return:     TRUE if successful.
//              FALSE if an error occurs.
//
//*************************************************************
 
BOOL RegDelnodeRecurse (HKEY hKeyRoot, LPTSTR lpSubKey)
{
    LPTSTR lpEnd;
    LONG lResult;
    DWORD dwSize;
    TCHAR szName[MAX_PATH];
    HKEY hKey;
    FILETIME ftWrite;
 
    // First, see if we can delete the key without having
    // to recurse.
 
    lResult = RegDeleteKey(hKeyRoot, lpSubKey);
 
    if (lResult == ERROR_SUCCESS) 
        return TRUE;
 
    lResult = RegOpenKeyEx (hKeyRoot, lpSubKey, 0, KEY_READ, &hKey);
 
    if (lResult != ERROR_SUCCESS) 
    {
        if (lResult == ERROR_FILE_NOT_FOUND) {
            printf("Key not found.\n");
            return TRUE;
        } 
        else {
            printf("Error opening key.\n");
            return FALSE;
        }
    }
 
    // Check for an ending slash and add one if it is missing.
 
    lpEnd = lpSubKey + lstrlen(lpSubKey);
 
    if (*(lpEnd - 1) != TEXT('\\')) 
    {
        *lpEnd =  TEXT('\\');
        lpEnd++;
        *lpEnd =  TEXT('\0');
    }
 
    // Enumerate the keys
 
    dwSize = MAX_PATH;
    lResult = RegEnumKeyEx(hKey, 0, szName, &dwSize, NULL,
                           NULL, NULL, &ftWrite);
 
    if (lResult == ERROR_SUCCESS) 
    {
        do {
 
            *lpEnd = TEXT('\0');
            StringCchCat(lpSubKey, MAX_PATH * 2, szName);
 
            if (!RegDelnodeRecurse(hKeyRoot, lpSubKey)) {
                break;
            }
 
            dwSize = MAX_PATH;
 
            lResult = RegEnumKeyEx(hKey, 0, szName, &dwSize, NULL,
                                   NULL, NULL, &ftWrite);
 
        } while (lResult == ERROR_SUCCESS);
    }
 
    lpEnd--;
    *lpEnd = TEXT('\0');
 
    RegCloseKey (hKey);
 
    // Try again to delete the key.
 
    lResult = RegDeleteKey(hKeyRoot, lpSubKey);
 
    if (lResult == ERROR_SUCCESS) 
        return TRUE;
 
    return FALSE;
}
 
//*************************************************************
//
//  RegDelnode()
//
//  Purpose:    Deletes a registry key and all its subkeys / values.
//
//  Parameters: hKeyRoot    -   Root key
//              lpSubKey    -   SubKey to delete
//
//  Return:     TRUE if successful.
//              FALSE if an error occurs.
//
//*************************************************************
 
BOOL RegDelnode (HKEY hKeyRoot, LPCTSTR lpSubKey)
{
    TCHAR szDelKey[MAX_PATH*2];
 
    StringCchCopy (szDelKey, MAX_PATH*2, lpSubKey);
    return RegDelnodeRecurse(hKeyRoot, szDelKey);
 
}
 
int __cdecl main()
{
   BOOL bSuccess;
 
   bSuccess = RegDelnode(HKEY_CURRENT_USER, TEXT("Software\\TestDir"));
 
   if(bSuccess)
      printf("Success!\n");
   else printf("Failure.\n");
 
   return 0;
}