Path problem on Windows: backslash vs forward slash

I can't figure out why the below code works fine:

#encoding: utf-8
require 'spreadsheet'

file_path =3D'\\\\server100\\Folder1\\Folder2\\ol=C3=A9ol=C3=A9-file.xls'=

Spreadsheet.client_encoding =3D 'UTF-8'
Spreadsheet.open(file_path) do |book|
  puts "sheets: #{book.worksheets.size}"
  sheet =3D book.worksheet(0)
  puts "First sheet name: #{sheet.name}"
end


But when I tried to do almost the same, just searching the most recent
file and pass it to the Spreadsheet like that, it doesn't work. Ruby
replaces back slashes by forward ones what causes a problem on Windows
box:


#encoding: utf-8
require 'spreadsheet'

folder =3D ''\\\\server100\\Folder1\\Folder2'
pattern =3D 'ol=C3=A9ol=C3=A9-*.xls'
Dir.chdir(folder)
source_files =3D Dir.glob(pattern)
puts "source files: #{source_files.inspect}"
recent_file =3D source_files.max_by { |f1| File.mtime(f1) }
Spreadsheet.client_encoding =3D 'UTF-8'
Spreadsheet.open(file_path) do |book|
  puts "sheets: #{book.worksheets.size}"
  sheet =3D book.worksheet(0)
  puts "First sheet name: #{sheet.name}"
end

The error I get is:

spreadsheet-0.6.8/lib/spreadsheet/excel/reader.rb:1172:in `setup':
undefined method `read' for false:FalseClass (NoMethodError)

I'm on Windows XP SP3, Ruby 1.9.3.
Thank you

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