My browser does not understand jagex-jav links.
I was able to go to RuneScape Classic during the re-opened window, however, by simply reading the link (used copy link, as it's hard to memorize and retype) and then making the appropriate variations on the instructions for using the RuneScape client to access Old School and/or DarkScape.
Before that, I told my browser to use the Jagex launcher as the application for handling jagex-jav links, but that produced an error, "unable to load configuration".
11-Jan-2016 14:34:30