First thing, i tested it on some Win-Versions, and it took everything like Instal*.exe and *Setup*.exe Really, name a exe-file Instalblahblah.exe and the installer-dialog will show it.
Second thing, the .com and .cmd belongs to normal Program-selection, not to the installers. but we can reduce it to .exe, of course.
Fair enough. We tend to mimic Windows behavior. I hadn't checked this myself. Note that it still should be Install*.exe rather than Instal*.exe, at least in English. --Juan