I've got a user's computer that I'm having trouble deploying an Excel
project to.  The project is in C#.  The final product is an xls and a
dll.  The manifest editor shows that the embedded manifest within the
xls is correct.  The installer works fine on my machine, my partner's
machine, and on another computer.  It seems to work on the user's
computer, but when the xls comes up, the assembly doesn't run.  It
doesn't error.  It just never loads.

So I'm looking for an alternative.  I was wondering if I could write a
simple app that would create an instance of Excel; and then could this
instance load the xls.  At that point, at least, everything would be
the same as it is now.  However, from within this app, could I invoke
the code in the assembly?

Has anyone done this?