I think it'll return "MSWin64" on 64bit Windows.

So far not: 

C:\test\miniball>perl -E"say $^O"
MSWin32

C:\test\miniball>perl -v

This is perl, v5.10.1 built for MSWin32-x64-multi-thread

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In reply to Re^2: $^O on windows-systems and Perl interna by BrowserUk
in thread $^O on windows-systems and Perl interna by esskar

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