如何在\ CLSD \ {XXXXXXXXX，xxxxxxxx，XXXXX，xxxxx} delphi xe2中的HKEY_CLASSES_ROOT中编程创建注册表项？

I tried to create regisrty key in HKEY_CLASSES_ROOT but windows doesn't allow to do this , I'm trying to create it in HKEY_CURRENT_USER \SOFTWARE\Classes\CLSID{xxxxxx-xxxxxxx-xxxxxxx-xxxxxx}\abc , but it didn't created.I tried to create regisrty key in HKEY_CLASSES_