Download Excel 2010 SDK: Excel 2010 XLL Software Development Kit from Official Microsoft Download Center

Excel 2010 SDK: Excel 2010 XLL Software Development Kit

Important! Selecting a language below will dynamically change the complete page content to that language.

English
The Microsoft Office Excel 2010 XLL Software Development Kit (SDK) contains conceptual overviews, programming tasks, and sample projects to guide you in developing Excel 2010 XLLs