This option allows to set the extension of the ISO file after download.
Defaults to "iso". It makes sense for building Mac OS X guests, where the
bootable image is actually a DMG, not an ISO.
In particular, it is important for "parallels-iso" builder to set the right extension.
Add support for using ctrl, shift and alt as key modifiers. So you can now achieve ctrl+c by using "<leftCtrlOn>c<leftCtrlOff>".
Updated documentation for new key stroke tokens.