Technically you dont need a file just delete it/ leave it deleted and you can still open a blank document.
If your OCD makes you recreate it then just follow these steps:
So you've changed/deleted/got an old version of your blank word document template
and rename normal.dotm to something else like add an undefscore to the end or .old
sart a new document in word, styles little corner box, drop down on the right of a style, change something like the font size , select 'new documents based on this documents' then OK. New file should be created. Go back and revert the change you made back again and you are off.
Dont forget your personal letterhead post here