How do you make your songs not become xml documentand tag

Audacity Help Forum Windows
1

I have this song i just downloaded from Youtube and I bass boosted it. After i bass boosted it and saved it to my folder.Then edited the metadata and asked me to save the metadata as the name of my song.When i clicked on it these stuff popped up <?xml version="1.0"?>
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2

See here: http://manual.audacityteam.org/manual/help/manual/man/audacity_projects.html