Try the usual fix for this.

ToolsOptionsGeneral Uncheck "Ignore Other Applications"

If no joy with that................

Close Excel first and On the Windows Taskbar

1) StartRun "excel.exe /unregserver"(no quotes)OK.
2) StartRun "excel.exe /regserver"(no quotes)OK.

See the space between exe and /regserver

You might have to designate a full path to excel.exe.

In that case StartRun "C:\yourpath\excel.exe" /regserver(quotes
required)OK.


Gord Dibben MS Excel MVP

On Mon, 1 Dec 2008 14:39:01 -0800, Teamlevy
wrote:

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