Save as MuseScore 3.2
Because version 4 is not accepted by many users, due to not implemented 3.x features, please implement an option to save the mscz also as verion 3.x compatible. Now I need to unzip and change the complete header of the mscx file. This should not be necessary, because you know how to implement it, and there is not much in version 4, that version 3 cannot recognize.
Comments
MS3.7 Evolution can open MS4 scores so you can then save them from MS3.7 and share with MS3 users, (or they can upgrade to MS3.7 as it's so much better than MS3.6.2).
see https://github.com/Jojo-Schmitz/MuseScore/wiki