What is an OSR file? Game replay created by osu!, a rhythm game where players synchronize mouse clicks with music; saves a recording of a song played by the user, as well as the player name, date played, score, hits and misses, and ranking; often used for sharing replays with friends.

More Information If you receive an OSR file, you can double-click it to see the replay summary and watch the replay (assuming the osu! software is installed). Replays can be saved at the end of a game by clicking the save replay or export replay option. OSR files are saved to the \​Replays\​ directory of the osu! software installation. You can copy these replays and send them to friends over email or another file transfer program.