file name endings for registry

Dooom

i got the new version of DVD RegionFree and in it was included a registry file. except i need to put that in the registry. anyone know about this? as in what the file ending is for reg files? maybe so they'll automatically go wherever they're supposed to go...anyway here's the bit of info in the email:

We have updated our register system in version 3.0 to prevent others
providing a "keygen" for our software and making an unfair profit from our
product.

You will find your personal registration key file (DVDRegionFree.key)
attached to this e-mail.

You should install the latest version of DVD Region-Free 3.0 before
registration action. After this, please open the attached key file in your
e-mail client (point at the attach name with the mouse cursor and then
double-click on it). After that you'll see the following message:

'Information in DVDRegionFree.key been successfully entered into the
registry'.

Then run DVD Region-Free and you will find your name under the 'Registered
to:' string. If so, all trial version restrictions are automatically removed
from your version.

thanks for any help.
oh and for obvious reasons i won't post up the file itself.

MrPinK

A .reg extension will make it a registry file. Usual 'always backup your registry first' warning applies (does anyone really do that? ).