There are 3 file types use the .MPR file extension:
1. FileMaker Dictionary File
Data file used by FileMaker, a desktop database application; contains a standard dictionary word list used by the software's spell checker; supports multiple languages.
MPR files are stored in the /Extensions/Dictionaries/ folder within the application's installation directory.
Updated: January 8, 2011
3. Direct Mail Project File
Project file used by older versions of Direct Mail email marketing software; saves all messages, history, and mailing lists in a single file; changed to the .DMPR extension in recent versions of the software so that it wouldn't conflict with the FileMaker Pro ".mpr" file type.
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Updated: March 12, 2012