Ho bisogno di aiuto, Xcode mi fa solo creare file ma quando ne voglio aprire uno mi da errore

Some questions...

Are the contents of that file viewable using a text editor? (Using BBEdit, vim, emacs, pico, teco, or whatever other editor (other than Xcode) that you're usually using.)

Which version of Xcode is installed here, and which version of macOS?

Do other files and other Xcode projects open as expected?