title: File does not exist, while using roo in Ruby-on-rails
body: <p>I am developing a small Ruby-on-rails application. I am using 'roo' gem to open an excel file.
  But rails throws an IO error while attempting to open the file. It says file does not exist.
  It works fine in irb. My development machine is windows. Here is my code</p>
  
  <p><code>
  file ="#{RAILS_ROOT}/public/data/import.xls"<br>
  file.gsub!("\\","/")<br>
  workbook = Excel.new(file)
  </code></p>
  
  <p>Any help is appreciated
  thanks,<br>
  Abhilash</p>