Unlike developers on *nix machines, Windows users have to be explicit about rendering file. render can't figure it out because it tries to find ?/ in it's first argument if it's a string or symbol. '/' is the *nix file separator. Windows uses '\'. Ruby's File::SEPARATOR, since 1.9.x knows the right separator to use depending on the operating system. Using that would let Rails developers on Windows look normal and save them some keystrokes -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Core" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-core+unsubscribe@googlegroups.com. To post to this group, send email to rubyonrails-core@googlegroups.com. Visit this group at http://groups.google.com/group/rubyonrails-core. For more options, visit https://groups.google.com/groups/opt_out.