Windows Registry Editor Version 5.00] ; When the extension of this file reads ".txt" you can open it by clicking on it ; When the extension of this file reads ".reg" you can WRITE to the Registry by clicking on it. Be careful [-HKEY_CLASSES_ROOT\mpktfile] [-HKEY_CLASSES_ROOT\msctfile] [-HKEY_CLASSES_ROOT\mthdfile] [-HKEY_CLASSES_ROOT\mtxtfile]