I can't — simply because I'm an occasional lurker rather than MuseScore developer. You'd have to wait till one of them drops by.
Also, I think our views on what counts for open diverge by a few parsecs, because a) MuseScore 2.0 beta is available and will open the files, and b) the score is also available in MusicXML which you can open with just about any contemporary score editor, including MuseScore 1.3 that you have installed.
Also, I think our views on what counts for open diverge by a few parsecs, because a) MuseScore 2.0 beta is available and will open the files, and b) the score is also available in MusicXML which you can open with just about any contemporary score editor, including MuseScore 1.3 that you have installed.