There is only one file type that uses the .WJR extension:
ReGet Deluxe Data File
Data file used by ReGet Deluxe, a modern download manager for Windows XP and Vista; may store configuration information (Default.wjr), file queue data (Queue.wjr), or other information referenced by ReGet.
NOTE: In Windows Vista installations, the file "Default.wjr" file has been moved from the "Program Files" directory to the "User\Application Data" folder.
Updated: February 24, 2008