Access 2010 file extension...

[killbill07]

I just want to know about the new extension in Access 2010. I need to create a database with .mdb and I can't do it with Access 2010 'cause the new extension is .accdb or something like that (I don't remember :$) As you can see, I don't use it too much but I need to create a .mdb database now so my question is: How do I change the extension?
I tried to do it in the save file dialog, but there's no option.

[ChrisPadgham]

under the File tab click on "Save & Publish" in the right pane you will see .mdb format as one of the options. It will not let you use it however, if you have used any features specific to 2010 in the database