1 Major Bug, 1 Minor

• May 24, 2020 - 16:34

MuseScore 3.4.2, Revision 148e43f (should be most recent).
Windows 10 Home, Version 1903

These seem to be only on my end, but I have no idea how to fix them.

1 (Major) - Ever since an update or two after MuseScore 3 was released (i.e., a year or two, iirc), my program crashes ANY time I go to save or open a score. Making a new file works, and I can work on it, but in order to save the file, I have to quickly hit "Save" or "Save as" and click save with whatever it gives me, before it crashes. I assume this has to deal with the file program or something along those lines. I can't directly rename a file from MuseScore, that I named wrong, nor can I actually properly save what I am working with. Uninstall and fresh reinstall does not appear to work. I haven't properly made any music on here in a while due to it.

2 (Minor) - MuseScore 3 score files seem to be originally saved as ".mscz,", which is the wrong filename save. It should still be ".mscz", like MuseScore 2, in order to play.

I haven't seen anyone else with my issues, so I can't say for certain what it is.


  1. That is a backup file. If you want to load it remove the leading dot and following comma. I recommend also changing the name so it doesn't overwrite more recent work.

In reply to by Jojo-Schmitz

Touch anything that pulls up File Explorer, really. Opening a score, saving a score (new score that requires naming, as well as save as), etc. I've never seen anything like this either from checking out various bugs in this forum, so I'm as clueless as you.

In reply to by DarkPyroNinja

In MuseScore 3.4.2 on Windows 7 or 10? (Edit: yes, 3.4.2 and Windows 10 as per the initial post)
Try using the -w command line option to start MuseScore and check again. That crash may be related to the WebView part of the Start Center dialog (but File > Open should not be affected by that).
This has been reported to cause issues on some Windows 10 systems, but we've never been able to reprocuce, suspicion is some firewall or antivirus/malware protection tool causing this

In reply to by DarkPyroNinja

Could be a corrupt score in the folder you are in, MuseScore does try to build thumbnails. Try moving all the files out of there. Then if you can successfully save a new file to the now empty folder, and open it again, then maybe move the original files back in one at a time, or in batches, until you identify the culprit.

In reply to by Marc Sabatella

I apologize for the very late reply. Decided to see if it magically fixed itself, and try your advice with the score folder to no avail. Moving all the scores out, and trying to add a new one reproduced the same issue. I'm unsure of what's causing this at all.

I haven't tried the "-w" yet. Would I place that in the shortcut's info for where to open the .exe, or the command prompt?

Indeed, for the first, probably the score or one of the parts is corrupt. Removing all parts then regenerating them should fix it. If not, please attach it so we can investigate further.

The backup file you are seeing (the one ending in a comma - and also starting with a period) is not new with MuseScore 3, it's always been there. Normally it's hidden, but you must have only recently turned on display of hidden files in Window if you are just now noticing them. Either turn that option off again, or just ignore those and instead be sure to open the real file. Starting with MuseScore 3.5 there is an option to store these files elsewhere.

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