Userdata/mediasources.xml

Similar to sources.xml, but used to add custom network locations when browsing in the GUI for a path. Basically sources just for the "Browse for new share" window. mediasources.xml is only created when you "Add network location" from that window.

Advanced notes
One example of meadiasources.xml is listed below:

ftp://admin:password@xxx.xxx.xxxx.xxx:21/Video