Thanks. That solved it. Ya learn something new everyday!

I've had no troubles creating, backing up, and restoring database objects in that instance, but attaching a database...

Thanks for the replies. You'd think from the error message that the .mdf file was read-only, but it's not (I'd already checked that).

The problem appears to be OS-related. ...

Thanks for pointing me in the right direction. This was very helpful. Sorry if I chose the wrong subforum to post the question to.

I'm still not certain while Management Studio Express will navigate to some folders and not others, but I'll probably solve that issue someday.

Part of the problem may be that the...