I was working on a file and I accidentally clicked on something ( I
don't know what) and it disappeared. I brought it up again and it
there is nothing there. It still lives where it is supposed to live,
but no file comes up when I open it. Excel opens and that's it.

When I did a search for the file I get a message that says, " please
insert the last disk of the multi-volume set and continue." Huh??

Is this file gone for good, or is it just hiding somewhere?