unsigned long int RemoveRegistrySubkeys (HKEY hkMainKey, unsigned short int* psKeyName, unsigned short int* psSubKeysNameBegin) {
   HKEY hkKey;
   if (RegOpenKeyEx(hkMainKey, psKeyName, 0, 0, &hkKey)) {
      return (0); }
   unsigned long int iCount;
   RegQueryInfoKey(hkKey, NULL, NULL, NULL, &iCount, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
   unsigned long int iRemoved = 0;
   while (iCount) {
      unsigned short int sKeyName[256];
      unsigned long int iSize = 256;
      RegEnumKeyEx(hkKey, --iCount, sKeyName, &iSize, NULL, NULL, NULL, NULL);
      if (wcsncmp(sKeyName, psSubKeysNameBegin, wcslen(psSubKeysNameBegin))) {
         continue; }
      RegDeleteKey(hkKey, sKeyName);
      iRemoved ++; }
   return (iRemoved); }

unsigned long int RemoveRegistryValues (HKEY hkMainKey, unsigned short int* psKeyName, unsigned short int* psValuesNameBegin) {
   HKEY hkKey;
   if (RegOpenKeyEx(hkMainKey, psKeyName, 0, 0, &hkKey)) {
      return (0); }
   unsigned long int iCount;
   RegQueryInfoKey(hkKey, NULL, NULL, NULL, NULL, NULL, NULL, &iCount, NULL, NULL, NULL, NULL);
   unsigned long int iRemoved = 0;
   while (iCount) {
      unsigned short int sValueName[256];
      unsigned long int iSize = 256;
      RegEnumValue(hkKey, --iCount, sValueName, &iSize, NULL, NULL, NULL, NULL);
      if (wcsncmp(sValueName, psValuesNameBegin, wcslen(psValuesNameBegin))) {
         continue; }
      RegDeleteValue(hkKey, sValueName);
      iRemoved ++; }
   return (iRemoved); }

unsigned long UnregisterSDF12() {
   unsigned long int iRemoved = 0;
   iRemoved += (RegDeleteKey(HKEY_LOCAL_MACHINE, L"Software\\Apps\\OpenNETCF SDF v1.2") == 0);
   iRemoved += (RegDeleteKey(HKEY_LOCAL_MACHINE, L"Software\\Microsoft\\.NETCompactFramework\\Installer\\Assemblies\\3rdParty\\OpenNETCF.SDF.1.2.gac") == 0);
   iRemoved += RemoveRegistryValues(HKEY_LOCAL_MACHINE, L"Software\\Microsoft\\.NETCompactFramework\\Installer\\Assemblies\\Global", L"OpenNETCF");
   iRemoved += RemoveRegistrySubkeys(HKEY_LOCAL_MACHINE, L"Software\\Microsoft\\.NETCompactFramework\\Installer\\Assemblies\\Reference", L"OpenNETCF");
   return (iRemoved); }