Comment 3 for bug 1117840

We can do some shortcutting by using QSysInfo (http://doc.qt.digia.com/4.6/qsysinfo.html#WinVersion-enum) and then looking for a directory that *should* exist, following it up with a search if the expected dir wasn't found.

That way, we have a fallback, but don't go on some convoluted search if it isn't necessary....

Even if we don't use QSysInfo, we can have a list of "known locations" that we search for first, again falling back to a more extensive search if nothing is found.