I'm using Excel 2007, and I have written an add-in (.xla) with a single
macro that works fine. It is located in the default add-ins folder. I now
find I'd like to add in the Title & Comments properties, but I cannot get
access to these. When I open the .xla file the "Prepare" option is greyed
out, and when I use Windows Explorer to view the file I cannot modify the
Comments or Title field.

This must be simple. What could I be doing wrong ?