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If you are interested in programming Excel © add-ins, I suggest to download and to install

1. Microsoft © Visual C++ Express
2. Boost C++ Libraries
3. XLW - A wrapper for the Excel API.

For testing and for teaching purposes I am developing a small add-in example:

Open and use at your own risk, please read my disclaimer.

Sulprobil.xll - Excel © Add-in which you can copy into
                  C:\Users\[User_Name]\AppData\Roaming\Microsoft\AddIns
                  [Windows Vista, Excel 2007 ©]
Sulprobil XLL User Guide - How to use this Excel© add-in

Sources:

Sulprobil_C++_source.zip - Compressed C++ source files
Sulprobil XLL Installation Guide - How to install and to compile the source files