.XLL File

The xll file extension is mainly associated with Microsoft Excel, one of the most popular and powerful tool you can use to create format spreadsheets, graphs and much more.

The .xla file represents Microsoft Excel add-in, a file that Excel can load when it starts up to add new functionality. The file contains code (dynamic link in case of .xll Add-In) that adds additional functionality to Excel, usually in the form of new functions.

Microsoft Excel add-in files more usually have the .xla file extension.

MIME types used:

• application/excel
• application/vnd.ms-excel
• application/x-excel
• application/x-msexcel

Files with xll file extension can be typically found as add-ins for Microsoft Excel spreadsheet editor. Used to add new functions to Excel.

How to open:

You can import the *.xll files into Microsoft Excel to add new functions.

How to convert:

Add-ins usually cannot be converted to anything else.