If the “New Text Document” context menu entry gets corrupted or missing restore it by running the following .reg file
Content of the file:

Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\.txt]
“Content Type”=”text/plain”
@=”txtfile”
“PerceivedType”=”text”
[HKEY_CLASSES_ROOT\.txt\OpenWithList]
[HKEY_CLASSES_ROOT\.txt\PersistentHandler]
@=”{5e941d80-bf96-11cd-b579-08002b30bfeb}”
[HKEY_CLASSES_ROOT\.txt\shell]
[HKEY_CLASSES_ROOT\.txt\shell\open]
[HKEY_CLASSES_ROOT\.txt\shell\open\command]
@=”notepad.exe %1″
[HKEY_CLASSES_ROOT\.txt\ShellNew]
“NullFile”=””