gistfile1.rb

require 'rexml/document'
require 'pp'

if ARGV.size != 1
  puts "Usage: ruby fix.rb PROFILEBASEDIR"
end

Dir.glob("#{ARGV[0]}/**/mimeTypes.rdf").each do |p|
  puts "Processing p"
  buffer = ""
  doc = REXML::Document.new(File.new(p))
  element = REXML::XPath.first(doc, '//RDF:Description[@RDF:about="urn:mimetype:externalApplication:application/pdf"]')
  element.attributes["NC:Path"] = 'C:\Programme\Adobe\Reader 10.0\Reader\AcroRd32.exe'
  doc.write(buffer)
  File.open(p, 'w') do |f|
    f.write(buffer)
  end
end

puts "Done"