Arora is included in the Pandora firmware, and runnable from xfce's menu. Minimenu will use it for showing PND file documentation, but doesn't include a default way to launch it if you just want to run the browser.
This pnd file is just a wrapper to run the built in Arora.
Place it in /pandora/mmenu on an SD card, and it'll show up in minimenu, but not in xfce/etc. (They already have it, and you don't want a second icon for it in the xfce menu.)
This will show an "Arora Browser" icon in your Network/WebBrowser categories in minimenu