Now select another program and check the box "Always use this app to open *.schem files". Update your software that should actually open saving minecraft structures. Because only the current version supports the latest SCHEM file format. Search, therefore, e.g. on the manufacturer website ...
Minecraft is a 3D sandbox construction game. The game allows players to use various unofficialadd-onsand mods to enhance their gameplay. The Litematica includes most of the features available with the old Schematica and also provides some new capabilities. ...