Issue #877 has been updated by Michael Klishin.


Both cp1251 and cp1252 are ASCII extensions from Microsoft, and Ruby 1.8 strings assumes everything is ASCII unless you use multibyte gem or activesupport. So try that and if you can get it working in console (windows console, not irb) with mkdir, you can try using Kernel#system.
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http://redmine.ruby-lang.org/issues/show/877

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