The .pmf file extension is most commonly used for ESRI published map files that are created with the ArcMap map creation software. The PMF files contain read-only versions of map files that are created with ArcMap for the ArcReader software. These allow users who have not paid for the ArcMap software to read maps that have been created with the application. The PMF files can only be read and can not be modified. The data views, navigation, printing, layout, panning and zooming features of the map file can also be limited when the map is saved in the PMF format.
The .pmf file extension is also used for Pegasus Mail attachment files and Sony PlayStation PSP movie files.
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If you have additional information about the PMF file format or software that uses files with the PMF suffix, please do get in touch - we would love hearing from you.