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.xll file extension

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Microsoft Excel add-in file.

A .xll file is a Microsoft Excel add-in file. This provides additional custom functionality as an add-in in (or extra) for Microsoft Excel. The file is a compiled library file, which may have been developed using almost any development language.

.xll files are used in versions of Excel up to and including Excel 2003. .xll files are not used by later versions of Microsoft Excel.

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Can you add to this? Do you know of any applications not already listed which will work with .xll files, view .xll files or open .xll files? Are you able to contribute any additional reference information or file format information about .xll files or have you spotted any errors or omissions? If so please let us know by emailing us at feedback@cryer.co.uk - Thank you.