I am having problems opening Excel 2007 documents from Explorer. I have read
through the other threads and tried Excel Options/Advanced/General/Ignore
other applications. It did not work in my case.

I also tried run / Excel /unregister then /register. As well, this did not
solve the issue.

What I found was after double clicking the icon in explorer, Excel opens but
is blank. Then if I single click on the office button, the file opens. The
file also opens if I double click on the icon in explorer a second time
(after excel is already open).

Of course, I can also open a file by first opening Excel and going through
the Office/Open menu.
--
Dale