Hi The resolv.rb file from the standard library won''t work because it expects the win32/resolv library to work, which isn''t included. I suppose this thing will return in many places as the way MRI often detects whether it''s running on windows is by asking the RUBY_PLATFORM variable and then matching it against /mswin32|mingw|bccwin/ but on mono that also returns i386-mswin32 using rbconfig the host_os info is wrong and using RUBY_PLATFORM it will return something that includes mswin32 even on linux/mac osx. to fix it you have to change the file in lib/ruby/1.8/resolv.rb starting on line 286 replace the if .. then .. else with if ENV[''OS''] =~ /win/i DefaultFileName = System::Environment::system_directory + "\\drivers\\etc\\hosts" else DefaultFileName = ''/etc/hosts'' end Before I push my change I''d like to know if ENV[''OS''] also returns a string containing win on windows 9x/Me. And I don''t even remember if the hosts path is the same as it is on NT incarnations --- Met vriendelijke groeten - Best regards - Salutations Ivan Porto Carrero Blog: http://flanders.co.nz Twitter: http://twitter.com/casualjim Author of IronRuby in Action (http://manning.com/carrero) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://rubyforge.org/pipermail/ironruby-core/attachments/20090826/c1771a60/attachment.html>