MuseScore Thinks My .xml File Is Corrupted

Something very odd is happening to my file. After creating the .mscz file, then saving it as a .xml file to open with Lime Aloud (a program that uses Braille and speech so musicians who are blind can create music), when I save that file as a .xml from a .lim (the default file extension for Lime Aloud), MuseScore says that the file is corrupted for some strange reason. When a music file is saved as a .xml, it should work just fine, regardless of which music app you use. Is there a way to fix this issue?
Attached is the .xml file that I worked on.