I am unable to create a "custom menu item" that contains a URL with the "question mark" , meaning the query string character, and forcing a new browser page with the " target="new modifier. For some odd reason, the question mark causes this form of custom menu item to not work.
Here's an example of what does work:
Ricks Homepage|http://www.rjerz.com" target="new
Here is an example of what does not work:
Ricks Moodle Videos|http://www.rjerz.com/v/rjPlayer/rjPlayer.html?crs=moodle2" target="new
This gets translated by the browser as
It appears that the query character messes up the parser, substituting "%'s" instead of interpreting these.
(see discussions on moodle.org: https://moodle.org/mod/forum/discuss.php?d=277059#p1190910)