If there are any gems or non-standard libraries which need to be 
explicitly used in order for Ocra to pick them up, you just extend that 
section of code to use them before calling "exit", which quits your 
script and hands control back to Ocra.
Something like this would work to pick up the files for Watir:

if defined?(Ocra)
  Watir::Browser.new.close
  exit
end

Just remember that exe files are flagged as potentially dangerous, so 
you have to consider the security implications.

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