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What are docm Files?
...and How to Open Them

Docm is a new file extension in Word 2007. It is a close cousin to the docx file, but what does the "M" stand for? And why are security warnings popping up when when I try to open the file?

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The “M” stands for macro. A macro is a program that is embedded in a Word file used to automate repetitive tasks.

In Word 2007 and 2010, any file that contains a macro must be saved with this file extension.

You can still save a document that contains a macro as a docx file, but the macro will not be saved with the document.

the special Word document icon for macros

There are security reasons why Microsoft created the new file extension.

A macro is a piece of Visual Basic (VB) programming code that is embedded in the file. This programming code runs a script…which also means if it contains a virus, you allow the virus program to run on your computer.

Caution: Docm files contain programming code that could possibly contain a virus. Always scan received files with your anti-virus program before opening them.

The new extension alerts you that there is potentially harmful code contained in the document so you can take security precautions when opening it.

This article explains how to:

Opening Microsoft Word Macro-Enabled Files

If you do not own Word (or you own a previous version of Word) and cannot open a macro-enabled file, see the Word Tip How to Open docx Files without Word 2007.

Open a docm file the same way you open any Word file, double-click on the file name or the file icon and the file will open.

Even if you use Word 2007, you may have to change some program settings to use a Microsoft Word macro-enabled document. Overall security settings are changed in the Trust Center.

Changing the Trust Center Settings

If you are using Word 2007, but cannot run a macro in a macro-enabled file, check your document security settings. Here is how to access the Trust Center and view or change the settings:

  1. Click the Office Button.
    The Office Button
  2. Click Word Options.
  3. In the Word Options dialogue box, select Trust Center.
  4. Under Microsoft Office Word Trust Center, click Trust Center Settings.
    Trust Center Settings button
  5. Select Macro Settings.
    Selecting Macro Settings
  6. Choose the appropriate security settings for your working environment.

As you can see from the screenshot, I selected Disable all macros with notification. This disables macros in any documents I open unless they are located in a trusted location. (Trusted location settings can be changed by selecting Trusted Locations in the Trust Center.)

If you never expect to open documents that contain macros and want the highest document security settings enabled, select either Disable all macros without notification or Disable all macros except digitally signed macros.

I do not recommend selecting Enable all macros unless you know you are in a closed and secure computing environment (which is not likely).

If you open a document that violates your Trust Center rules, such as a document from an unknown source or one which is not located in a trusted location, the macro will be disabled and a security warning appears.

Security Warning notice


Enabling a Macro that has been Disabled

What happens when you receive a macro-enabled file and you want to run the macro, but Word has disabled it?

Follow these steps to enable the macro:

  1. Before opening the file, scan it with your anti-virus program to make sure the macro does not contain a virus.
  2. Open the file.
  3. On the Security Warning bar, click Options.
  4. Select Enable this content.
    The Microsoft Office Security Options alert box showing 'Enable this Content' selected
  5. Click OK.

You can now run Microsoft Word macros that are contained in the docm file.



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