After seeing this comment in regards to the release of FF13, I was wondering if the Installer is smart enough to recognize if the launcher.ini specifies a MinOS or MaxOS that the current system does not meet?
While blocking execution at the launcher stage is vital (to prevent installing FF13 on an OS > Win2k and then running it on Win2k), I think that (if it can't already) there needs to be a warning when installing to an OS that does not meet the MinOS or MaxOS of the app.
Otherwise those users who run apps from a local hard drive or who work regularly on older OSes will be unable to run their apps after updating. I could see this causing some very irate user complaints.