.HPR File Extension
File TypeInternal RoboHelp File
What is an HPR file?
Internal help file used by RoboHelp, an application used to create help and policy content across mobile devices; contains configuration information used internally when opening and saving RoboHelp projects.
You will most likely never see the HPR file since they are used internally by RoboHelp. They are not meant to be opened manually.
projectname.hpr - The HPR file is commonly named after the name of your project.