File extension should be preserved when using 'Save As...'
I have been saving files in the mscx format to allow them to store into GIT more easily.
If I use 'Save As…' on an mscx file, the Save Panel defaults to mscz. If I don't catch this I will save it out as the wrong format.
The Save Panel should match the current file format when saving.
1. open a score in the mscx format
2. File -> Save As…
3. Save the file
The file was converted to mscz format
The file was save as mscx as it was opened