Sorts of MMC Files

Chief MMC Description

.MMC

Extension:	.mmc
Category:	Microsoft Media Catalog

The MMC file extension may refer to a data file related to the Microsoft Office Suite. The contents of this file may include a collection of images in an organized format; such as the media content of the MS Office clip gallery, Microsoft ClipArt database, or other media. "Artgal50.mmc" catalog file is an example of MMC files that contains images, thumbnail previews, and keywords used by the Clip gallery.

Author:	Microsoft Corporation
Kind:	Data Files
Location:	HKEY_CLASSES_ROOT\.mmc

Software Programs That Open The Microsoft Media Catalog:

Microsoft Office by Microsoft Corporation

Windows

Mac

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Sources of MMC Problems

Common Problems Opening MMC Files

Microsoft Office Not Present

If you attempt to load your MMC file, you experience a message such as "Can't Open MMC Files". If this is the case, it's usually due to the fact that you do not have Microsoft Office for %%os%% installed on your computer. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.

Tip: Another MMC-related program can be selected to open the file by clicking "Show Apps" and finding the application.

Wrong Version of Microsoft Office is Installed

Occasionally, you might have an outdated version of Microsoft Office installed that's incompatible with your Microsoft Media Catalog type. Installing the latest version of Microsoft Office from Microsoft Corporation is recommended. The primary cause of this problem is that your Microsoft Media Catalog file was created by a different (newer) version of Microsoft Office than what's installed.

Tip: Find clues on the correct software version by right-clicking your MMC file and clicking "Properties".

Summary: Not having the right Microsoft Office version on your computer can cause problems opening MMC files.

Other MMC File Opening Causes

In the majority of cases, installing the right version of Microsoft Office will resolve your issue. If you're still experiencing problems opening MMC files, there could be other computer problems. These issues include:

• MMC file references in the Windows Registry are broken
• Deletion of the MMC file description from the Registry by mistake
• Incomplete or bad installation of a software application associated with the MMC format
• Your MMC can't be loaded properly (file corruption)
• Past or present virus infection has affected your MMC
• Hardware associated with MMC has outdated drivers
• Too many applications are open on your PC to load your Microsoft Media Catalog file successfully