??I'm not entirely sure of what type of add-in is being discussed here as the discussion has ranged from VBA to VB and dll files etc.?? :confused:
If you're interested in VB and don't already have this, click the link below to download a free 'envelop' VB compiler that allows you to create your own stand-alone projects. (if that's what you mean)
As it also includes a packager, you can package the project, have links to XL (or the reverse) etc.
http://www.freebyte.com/programming/...s/envelop.html :bink:
Regards, John...