Not if we're talking about the real world (implementation), rather than the theoretical capability of a language in itself. Perl and Ruby don't see much love on Windows, particularly with GUI toolkits and the like. Python is the only one of the three that feels comfortable using on Windows, from the skeleton of the app down to actually distributing it. Java is really good at cross platform apps though.

This is one of the few things that irks me in programming communities, often you'll seen criticism or praise of a point in a language, and then some language lawyer comes and talks about what said language can do in theory, rather than looking at the practicalities of actual, real world implementations, the community and culture surrounding it and so on. No one gives a crap if any dynamic language COULD be made to work the right way on many OS, people care if the work is done, not if it COULD be done.

The worst offenders are of course people victim of the sufficiently smart compiler curse.