Issue #877 has been updated by Usaku NAKAMURA.

Category set to core
Status changed from Open to Rejected
ruby -v set to -

There are no plan to resolve the original problem on 1.8.
You must pass the path with Win32 file API's encoding to ruby.

I know it's VERY inconvenient for users in Europe, but we cannot break compatibility of commandline/path handling in 1.8 branch.
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http://redmine.ruby-lang.org/issues/show/877

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http://redmine.ruby-lang.org