The Excel Developers Kit has been out of print for almost a decade, sadly there has been no update, but you can find a e-copy here:
http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/office97/html/edkfrnt.asp
Most of the stuff is out of date now and much of the C++ stuff just wont work - I understand that some of it didn’t work when it was […]