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.XLAM file extension

To open .XLAM files on Windows, open Microsoft Excel.

To open a .xlam file, use Microsoft Excel and load it as an add-in. Because .xlam files are macro-enabled, only enable them if you trust the source.

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Last updated: June 12, 2026

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .XLAM files

Use these platform-specific instructions to open .XLAM files safely.

Windows

  1. Open Microsoft Excel.
  2. Go to the Add-ins manager in Excel and add/enable the file type “Excel add-in (.xlam)” (browse to the .xlam file if needed).
Full Windows guide

Mac

  1. Open Microsoft Excel for Mac.
  2. Use Excel’s add-ins management to add/enable the “Excel add-in (.xlam)” file (browse to the .xlam file if needed).
Full Mac guide

Linux

  1. .xlam files are intended for Microsoft Excel; if you don’t have Excel available on Linux, transfer the file to a Windows or macOS system with Excel to load it as an add-in.
Full Linux guide

iOS

  1. .xlam is an Excel add-in format; if your Excel app cannot load it as an add-in, open it on a desktop version of Excel (Windows/macOS) and install it there.
Full iOS guide

Android

  1. .xlam is an Excel add-in format; if your Excel app cannot load it as an add-in, open it on a desktop version of Excel (Windows/macOS) and install it there.
Full Android guide

Security notes

  • .xlam files are macro-enabled add-ins and can contain executable macro code; treat them as potentially risky when they come from untrusted sources.
  • Only enable or install a .xlam add-in if you trust who provided it and understand why you need it; enabling macros grants code execution within Excel.
  • If you received a .xlam unexpectedly (email/download), verify its origin before loading it into Excel’s add-ins list.

If you did not expect this file

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Can't open this file?

These are the most common causes and fixes when .XLAM files fail to open.

Common reasons

  • Excel opens, but the add-in features don’t appear
  • Macros or custom functions are blocked
  • Wrong application tries to open the file

Fix steps

  1. In Excel, use the add-ins management options and add/enable the “Excel add-in (.xlam)” file.
  2. If it’s listed but not active, uncheck it, close Excel, reopen Excel, then re-check it.

OS-specific troubleshooting

What is a .XLAM file?

.xlam is the file extension used for an Excel add-in that is macro-enabled, meaning it can include VBA macros and custom functions used within Excel. Microsoft’s documentation explicitly identifies “Excel add-in (.xlam)” as an add-in type and notes that an Excel add-in will have the .xlam extension.

Background

.xlam is the modern Excel add-in format used to package reusable Excel functionality—such as custom functions, automation macros, and tools you want available across workbooks. Instead of opening as a typical spreadsheet document, it is usually loaded into Excel so its features appear in the Excel UI and are available in the current session (or persistently, depending on how it is installed).

Common MIME types: application/vnd.ms-excel.addin.macroEnabled.12

Further reading

Authoritative resources for more details on the .XLAM format.

Common .XLAM issues

Excel opens, but the add-in features don’t appear

A .xlam typically needs to be installed/checked in Excel’s add-ins list; double-clicking may not reliably activate it as an add-in in every setup.

  1. In Excel, use the add-ins management options and add/enable the “Excel add-in (.xlam)” file.
  2. If it’s listed but not active, uncheck it, close Excel, reopen Excel, then re-check it.

Macros or custom functions are blocked

.xlam is macro-enabled, so Excel’s macro security settings or trust decisions can prevent the add-in’s code from running.

  1. If prompted, only enable the add-in’s macros when you trust the source.
  2. If macros are disabled and you trust the file, review Excel’s macro/security prompts and re-load the add-in.

Wrong application tries to open the file

File associations may point .xlam to a different program, but .xlam is specifically an Excel macro-enabled add-in.

  1. Open Microsoft Excel first, then load the .xlam via Excel’s add-ins management rather than opening it from the file manager.
  2. On Windows/macOS, change the default app association for .xlam to Microsoft Excel if needed.

FAQ

What is a .xlam file used for?

It’s an Excel macro-enabled add-in used to provide reusable features such as macros and custom functions inside Excel.

Is .xlam the same as .xlsx?

No. .xlsx is a workbook format, while .xlam is an add-in format intended to be loaded into Excel to extend functionality and can include macros.

What MIME type is associated with .xlam?

A commonly used MIME type for Excel macro-enabled add-ins is application/vnd.ms-excel.addin.macroEnabled.12.

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