Opening an add-in automatically
 

I'm trying to use the library Morefunc and distribute my workbooks among
several people. I would like some way to do this without having to install
the library in every PC. I found there's a file Morefunc.xll which can be
opened from Excel, but I can't make it work from a macro with the following
instruction:

Workbooks.Open "C:\Morefunc.xll", True, True

Any suggestions?