.MMC File Extension
Microsoft Media Catalog
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What is an MMC file?
Contains a collection of images (such as a clipart gallery) or other media in an organized format; typically saved in the \Application Data\Microsoft\Media Catalog directory.
An example of an MMC file is the "Artgal50.mmc" catalog file, which contains images, keywords, and thumbnail previews used by Clip Gallery.
Programs that open or reference MMC files
Microsoft Clip Gallery