This article explains what XLAM files are, how to open them, and what options you have for converting them to another format.
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A file with the XLAM file extension is a macro-enabled add-in file used to add new features to Microsoft Excel. Like Excel's XLSM and XLSX file formats, these add-in files are XML-based and saved with ZIP compression to reduce overall size.
XLAM files can be opened with Microsoft Excel 2007 and later. Earlier versions of Excel can also open them, but only if the Microsoft Office Compatibility Pack is installed.
There are two primary methods to open the file: