XLAM field Leave feedback On this page XLAM field See Also XLAM field XLAM is an Macro-Enabled Add-In file that is used to add new functions to spreadsheets. An Add-In is a supplemental program that runs additional code and provides additional functionality for spreadsheets. Learn more about this file format here. See Also class SpreadsheetFileType Was this page helpful? Not really Yes, thanks Any additional feedback you'd like to share with us? Skip Send Please tell us how we can improve this page. Skip Send Thank you for your feedback! We value your opinion. Your feedback will help us improve our documentation.