This page is specific to

The 2007 product release

Other versions are also available for the following:

The 2010 product release

Excel 2007 XLL Software Development Kit Documentation

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.

In This Section

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.

Free

XLW

http://xlw.sourceforge.net/

Develop xlls in C++ or .NET, has code generation to simplify process especially for numerical/financial add-ins.

nxll

http://xll.codeplex.com/

Updated version of Keith Lewis' wrapper code.

Excel-DNA

http://exceldna.codeplex.com/

Quick, easy, fast .NET wrapping.

Commercial

Xll+

http://www.planatechsolutions.com/xllplus/default.htm