سلام. ی روش دیگه هم هست که می تونید از رجیستری کمک بگیرید.
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\CLSID\{D190CE8D-E929-47B1-8D6C-717BD5A251FB}]
@="My NotePad"
[HKEY_CLASSES_ROOT\CLSID\{D190CE8D-E929-47B1-8D6C-717BD5A251FB}\DefaultIcon]
@="%system32%\\shell32.dll,1"
[HKEY_CLASSES_ROOT\CLSID\{D190CE8D-E929-47B1-8D6C-717BD5A251FB}\shell]
[HKEY_CLASSES_ROOT\CLSID\{D190CE8D-E929-47B1-8D6C-717BD5A251FB}\shell\Open]
@="&open"
[HKEY_CLASSES_ROOT\CLSID\{D190CE8D-E929-47B1-8D6C-717BD5A251FB}\shell\Open\Command]
@="notepad.exe"
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\Curre ntVersion\Explorer\Desktop\NameSpace\{D190CE8D-E929-47B1-8D6C-717BD5A251FB}]