How do I get FF to always open doc files with Word 2007?

In Firefox 3.0.4, when I'm on a board, and one of the entries includes Word document, when I click it, Firefox always asks "Open with what..." and grays out the "always use this..." option.

When I click the file it isn't asking about a Word document, but that is what the attached file is...

I was going to attach the file, but see nowhere to attach it. the file type it is asking about is


and it isn't showing the extension, which is doc.


Chuck Billow