Lower priority for text/x-mpsub's magic, so it doesn't match pcb-drillFile.drl
FORMAT= in the first 128 bytes is very unspecific magic, it happens to match pcb-drillFile.drl too (which is a application/x-excellon file, and can be detected as such because it starts with M48)
Found when porting QtCore to shared-mime-info 2.3