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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

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This content is outdated and is no longer being maintained.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.

Getting Started with the Excel 2007 XLL SDK

Provides links to relevant concepts to help you start creating DLL add-ins for Excel 2007 that use the C API.

Developing Excel 2007 XLLs

Links to general Excel information, guidance on best practices, and warnings of known issues and common mistakes.

Excel 2007 XLL SDK API Function Reference

Provides a reference for the Excel callbacks that an XLL can call, the XLL callbacks that Excel looks for, and the key functions in the sample projects.

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