when i go to preferences and click on media types, there is a list of all these different media types with checkboxes next to them. They also say what program that type is currently assigned to. are the check boxes for changing a media type associated with a different program to RealOne? If nothing is checked, will nothing play in realone unless i specifically tell the file to open with it? what if the media type is currently assigned to RealOne but it is not checked? what does that mean?