Just run regedit... Use this key below:
----------------------------------------
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}]
@="Messenger Application"
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}\InProcServer32]
@=""
"ThreadingModel"="Apartment"
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}\LocalServer32]
@=""
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}\ProgID]
@="Messenger.MessengerApp.1"
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}\Programmable]
@=""
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}\TypeLib]
@="{218CB45F-20B6-11d2-8E17-0000F803A446}"
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}\Version]
@="1.0"
[HKEY_CLASSES_ROOT\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}\VersionIndependentProgID]
@="Messenger.MessengerApp"