Question: how to open mscz file type?
Answer: Open Musescore files. You can open Musescore mscz files with the SongBook section in the Musescore app. Upon opening the mscz file will be added to the apps internal library. You can use apps such as Mail, Safari, Dropbox, Google Drive and more to browse for mscz files and open them directly into the Musescore app.