File Extension XLL

Information about XLL files and how to open them

An XLL - Excel add-in file is a format designed for use by Microsoft's Excel spreadsheet and database creation program. XLL files are similar in concept to the standard Windows DLL and contain templates and certain extra functions that can greatly improve the existing abilities of the Microsoft Excel software. If you've created your own template for future use in Excel, for example, the program would save that template in the XLL file format.

Product(s) that can open XLL file

Microsoft Office
Microsoft Office
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