Can't use ruby-rtf gem

I'm new to ruby, rails, and gems, and trying to add an feature to a RoR's app so users can export a file, and then edit it using Microsoft's Word. (This is an app where telling folks to use OpenOffice or some other editor isn't really an option). So I researched a little and think that using ruby-rtf to create rtf files is the best way to go. However, I can not use this gem; and I'm not sure if I did not install it properly or what.

I downloaded the rtf-0.1.0.gem file and ran "gem install rtf-0.1.0" and now if I do a "gem list" I see it in the list. So I create a file called rtf.rb which contains this:    require 'rubygems'    require 'rtf'    include RTF    document = Document.new(Font.new(Font::ROMAN, 'Times New Roman'))    document.paragraph << "This is a short paragraph of text."    File.open('my_document.rtf') {|file| file.write(document.to_rtf)} and then run it with "ruby rtf.rb", and get this: ./rtf.rb:3: uninitialized constant RTF (NameError)         from C:/ror/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/ custom_require.rb:27:in `gem_original_require'         from C:/ror/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/ custom_require.rb:27:in `require'         from rtf.rb:2 This is all happening on a Windows PC.

Can someone tell me what I've done wrong?

Joshua Levy