Software & Apps File Types How to Open, Edit, and, Convert XLAM Files Share Pin Email Print File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated December 01, 2019 A file with the XLAM file extension is an Excel Macro-Enabled Add-In file that's used to add new functions to Excel. Similar to other spreadsheet file formats, XLAM files contain cells that are divided into rows and columns that can contain text, formulas, charts, images, and more. Like Excel's XLSM and XLSX file formats, XLAM files are XML-based and saved with ZIP compression to reduce the overall size. Excel Add-In files that don't support macros might use the XLL or XLA file extension. How to Open an XLAM File Macros in an XLAM file may contain malicious code. Take great care when opening executable file formats received via email or downloaded from websites you're not familiar with. XLAM files can be opened with Microsoft Excel 2007 and newer. Earlier versions of Excel can open XLAM files, too, but only if the Microsoft Office Compatibility Pack is installed. This can be done in a number of ways. No matter which route you go through Excel's menus, the result will bring you to the Add-Ins window where you can click Browse to load the XLAM file. If your add-in is already listed in this window, you can just put a check next to the name to enable it. The first is through the File > Options > Add-ins > Go button, and the other is by using the Developer > Add-Ins menu at the top of Excel. See this Microsoft how-to to learn how to enable the Developer tab if you don't already see it. The latter method, through the Developer tab, is also used to open COM Add-Ins (EXE and DLL files), via the COM Add-Ins button. Yet one more option for opening XLAM files in Excel is to put the file in the right folder for Excel to read from when it opens. This should be C:\Users\[username]\AppData\Roaming\Microsoft\AddIns\. Some XLAM files that are downloaded from the internet are blocked and can't be fully used in Microsoft Excel. Right-click the file in File/Windows Explorer and choose Properties. In the General tab, click Unblock to have full access to it. If you find that an application on your PC does try to open the XLAM file but it's the wrong application or if you would rather have another installed program open XLAM files, you can still make that change in Windows. How to Convert an XLAM File There shouldn't be any reason to use a file converter to save an XLAM file to a different format. See this Excel Forum thread on converting XLAM to XLSM if you want to do that. It involves editing the IsAddIn property to False.