Speaking of Internet Browser, I can already open web links in the Internet Browser, including for example, an .mp4 link, from an rpx app. I may start my project using this method to launch the media links, until I can get a good media player coded.
If anyone wants to try out the Browser Test app, here is a link -
http://www.mediafire.com/file/lfbst3k936jqy3a/Browser_Test.7z
This is an installable channel on your sysNAND or USB, but I advise only installing to USB to be safe. It of course can only be installed or launched if you have sig patching enabled.