Here are a couple of articles that you may find useful
HOWTO: Build an Add-in (XLL) for Excel Using Visual C++
http://support.microsoft.com/default...b;en-us;178474
XLL A library for creating high performance Excel add-ins
http://xll.sourceforge.net
Justin Starnes wrote:
Where can I find an example or help creating an XLL? I'd like to create an
add-in that allows new Excel formulas.