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The Microsoft Office Excel 2013 XLL Software Development Kit (SDK) contains conceptual overviews, programming tasks, and sample projects to guide you in developing Excel 2013 XLLs.

• The Excel 2013 XLL SDK includes the following:
  
  
  • C API includes header and source files that enable a DLL to access Excel 2010 functionality, and a description of the interface that a DLL should expose to work with the Excel Add-in Manager.
  • Microsoft Visual Studio 2008 projects includes C/C++ source code and shows how to use the C API.
  • Documentation includes the API function reference, conceptual, and how-to Help topics.
  
  In conjunction with Microsoft Excel 2013, the Microsoft Excel 2013 XLL Software Development Kit (SDK) includes support for the following new features:
  
  • New Functions The Microsoft Excel 2010 XLL SDK supports calling back to all of Excel 2013's new worksheet functions.
  

Files

Status: Live This download is still available on microsoft.com. The downloads below will come directly from the Microsoft Download Center.

File	Size
excelxllsdk.msi SHA1: c16dda7c359dfbb88a17f995a887368bab1f3192	1.06 MB

File sizes and hashes are retrieved from the Wayback Machine’s indexes. They may not match the latest versions of files hosted on Microsoft servers.

• • This download works with the following applications:
  
  
  • Microsoft Visual Studio 2005
    -OR-
    Microsoft Visual Studio 2008 for 64-bit XLLs
  
  
  • Microsoft Excel 2013
  
  

• To install this download:
  
  1. Download the file by clicking the Download link (above) and saving the file to your hard disk drive.
  2. Double-click the ExcelXLLSDK.msi program file on your hard disk drive to start the setup program.
  3. Follow the instructions on the screen to complete the installation.