The primary development system for me is my Linux box at home. I don't know
what Sun was thinking here, to have differences in naming JARs between OSes
because as you can see here, it maks things lesser universal (difference
between OSes in naming JARs) which means on your Windows(/MacOS) box you may
have to ignore these properties files unless you want to add another lib and
then you have to be careful.
Well, not 100% universal after all which needs improvement. Let's hope, Apache
is ruling this out, at least for NetBeans IDE.