Please don't post questions in the feature suggestion box. That's not what
it's for.

I assume that by Outlook 20 you actually meant Outlook 2002 because the
problem of not being able to delete single entries in the autocompletion
dropdown is fixed in Outlook 2003. The only workaround for Outlook 2002 is
to to send a message using a name or address that will add another entry to
that dropdown list. Then you will have the ability to use the arrow key to
select the name you want to remove.

Your search for NK2 files will succeed if you enable the search and display
of hidden files.