colors not copied on Cygwin (fiddle.rb::dlopen fails)

[VladimirAlexiev]

When I use highlight2clipboard-copy-region-to-clipboard, the text is copied but without colors.

Here's my environment:

>ruby -v
ruby 2.3.6p384 (2017-12-14 revision 9808) [x86_64-cygwin]
last_commit=ruby 2.3.3

>uname
CYGWIN_NT-10.0

ELISP> emacs-version
"26.1"
ELISP> (concat highlight2clipboard--directory "bin/highlight2clipboard-w32.rb")
"c:/my/.emacs.d/elpa/highlight2clipboard-20151020.1840/bin/highlight2clipboard-w32.rb"

The HTML file is created correctly, so I tried to run the ruby script from the command line:

>ruby c:/my/.emacs.d/elpa/highlight2clipboard-20151020.1840/bin/highlight2clipboard-w32.rb c:/tmp/h2c-cb6uYe.html
/usr/share/ruby/2.3.0/fiddle.rb:47:in `initialize': No such file or directory (LoadError)
        from /usr/share/ruby/2.3.0/fiddle.rb:47:in `new'
        from /usr/share/ruby/2.3.0/fiddle.rb:47:in `dlopen'
        from /usr/share/ruby/2.3.0/Win32API.rb:15:in `initialize'
        from c:/my/.emacs.d/elpa/highlight2clipboard-20151020.1840/bin/highlight2clipboard-w32.rb:68:in `new'
        from c:/my/.emacs.d/elpa/highlight2clipboard-20151020.1840/bin/highlight2clipboard-w32.rb:68:in `add'
        from c:/my/.emacs.d/elpa/highlight2clipboard-20151020.1840/bin/highlight2clipboard-w32.rb:36:in `init_functions'

        from c:/my/.emacs.d/elpa/highlight2clipboard-20151020.1840/bin/highlight2clipboard-w32.rb:77:in `<class:W32>'
        from c:/my/.emacs.d/elpa/highlight2clipboard-20151020.1840/bin/highlight2clipboard-w32.rb:34:in `<main>'

I looked into fiddle.rb and the error is in this line:

>less +47 /usr/share/ruby/2.3.0/fiddle.rb
  def dlopen library
    Fiddle::Handle.new library
  end

Looks like I need some extra module?