Set UpgradeCode for Product element.
Replaced - in element IDs by _ to satisfy the XML schema check of candle.exe.
Fixed a typo (OpeVPN).
Dear Microsoft you fucking shitheads. It's 2013 by now and you still think it's a good idea to not use UTF-8 by default on everything?
You don't even support UTF-8 in WiX at all, because you're not able to properly convert it to some of your ancient codepages?
Get your fucking shit together! UTF-8 and nothing else!
See also: http://wix.sourceforge.net/manual-wix3/codepage.htm