The "RJ" prefix is used by DLsite , a major Japanese marketplace for indie (doujin) games, manga, and audio.
Right-click the file and select "Extract Here." If the file is password-protected, the password is often the site URL where it was downloaded or simply the RJ-code itself. H-RJ01019462.rar
The .rar extension means the contents are compressed to save space. You will need a tool like WinRAR , 7-Zip , or The Unarchiver to open it. How to Open and Use the File The "RJ" prefix is used by DLsite ,
Use a tool like Locale Emulator to run the application in a Japanese environment without changing your entire Windows language settings. H-RJ01019462.rar