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.
File Extension XLL
Product(s) that can open XLL file
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