Converting mscx to mscz?

I have a current project which is completed, however sometime in development the file was corrupted. I opened the mscz as a zip and found an archived version stored as a mscx file, so that is the version I am using. However, this version can't be uploaded to musescore. Is there a way to directly copy over or will I have to make a new mscz and put everything in again (this would not be too hard, but with the amount of time signature changes, tempo changes, etc that don't get copied it would be a bit of a hassle)?