When I click on a file in windows explorer, it opens that file in a new
instance of excel. I know that it is supposed to open up in the same instance
of excel. How do I get new files that I click on in windows explorer to open
up in the currently running instance of excel by default like it should be?

I don't know if this has anything to do with it, but when I look at the
shortcut to excel in C:\Documents and Settings\All Users\Start
Menu\Programs\Microsoft Office and click the advanced properties, the "run in
separate memory space" is checked and grayed out so I can't change it.

Thanks for any help,
Randy