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Excel 2007 XLL Software Development Kit Documentation
This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This page may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.
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.