ahha hahhaha... sorry i could not resist..
Beside my personl belief (ie Things are getting Worst..) we I can suspect that microsoft does not love so much Perl applications despite many efforts of the Perl community. we have strawberry Perl.
That said it must be a way to make CGIs running on IIS 8.5.. But as i experienced you run on your own.
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.