#!c:/ruby/bin/rubyw.exe
require 'win32ole'
require 'timeout'

filename = ENV['TM_FILEPATH'].chomp.gsub(/\\/, '/').capitalize
url = "file:///" + filename

# Methods
def openNewBrowser(url)
  begin
  Timeout::timeout(5) {
    ie = WIN32OLE.new('InternetExplorer.Application')
    ie.Navigate("#{url}")
    sleep('.2'.to_f) while ie.ReadyState != 4
    ie.Visible = 'true'
  }
  rescue Timeout::Error
    puts "Unable connect to #{url} in a reasonable time"
  end
end

def refreshIfOpen(url)
   shell = WIN32OLE.new('Shell.Application')
   shell.Windows.each do | window |
    if window.LocationUrl == "#{url}"
        window.refresh()
        return true
    end
   end
return false
end

# Main
unless refreshIfOpen(url)
   openNewBrowser(url)
end

Preview in IE command (Windows native version)

command, textmate

Ruby