File Extension NPR File Format Lotus Notes Reporter File NPR stands for Lotus Notes Reporter File. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question C API to user32.dll in Notes eclipse 8.x does not work Lotus Notes importance of Android Lotus Notes Meeting Invitations disappeared!