Information about the .xll (xll) file type

Below is all the information we have available on file about the .xll (xll) file type.

.xll
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.

The following link provides further information related to the .xll file extension:

Where this is available we would like to include file format information on .xll files, as well as information on how to view or open files of type .xll. If you know of any information which we have missed then please let us know.