Open Folder Options, click the "File Types" tab, scroll down to REG and
highlight, click "Advanced" button, click Edit, click "Edit" button, and
you should have these entries:
Action: Edit
Application used to perform: C:\WINDOWS\system32\NOTEPAD.EXE %1
. Use DDE
Application: NOTEPAD
Topic: System
The panes I left out are blank.
hth,