The world should now appear in your single-player menu. Why use .7z for Minecraft? How to BACKUP your Minecraft World! 1.21.4 (Java Edition)
Press Win+R , type %appdata% , and navigate to .minecraft/saves . Minceaftbackup.7z
Drag the extracted world folder into this "saves" directory. The world should now appear in your single-player menu
Critical metadata that determines the world seed and game settings. and End dimensions.
Data for the Overworld, Nether, and End dimensions.