osu! What is an OSZ file? An OSZ file is a beatmap file used by osu!, a free rhythm game in which players click and drag on-screen items in time with music. It containsZip-compresseddata that is used to play music, display graphics, and show players where and when they must interac...
, and not via File Explorer and other non-osu! applications. At one point, it was thought that the OSZ2 format would become osu!'s primary beatmap format. However, players seem to prefer the OSZ format, as they enjoy the ability to edit levels outside osu!....