openwith menu not working

[synerdragon]

open with menu option in right click is not working,why is that

[cluberti]

Look in the registry editor, specifically at the HKEY_CLASSES_ROOT\txtfile key, and see what's under \shell\open\command\ subkey. The (Default) expand value, by default on an XP install, should point to "SystemRoot%\system32\NOTEPAD.EXE %1". This key (txtfile) is where the right-click "Open with" menu is built from, so it's highly likely this location in the registry has been modified for some reason and no longer contains a valid command key and value.