Excel 2007 XLL Software Development Kit Documentation
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The Microsoft Office Excel 2007 XLL Software Development Kit (SDK) is designed to help you understand the concepts and technologies that relate to creating DLL add-ins for Excel 2007 that use the C API. The C API enables DLLs to tightly integrate with Excel 2007 and access its internal functionality. These DLL add-ins are known as XLLs.
The Excel 2007 XLL Software Development Kit contains a framework library that helps speed up the writing of XLLs, and sample projects to help you get started.
Download the Excel 2007 XLL SDK.