op1-en-US.jar:
% locale    op1    en-US    %locale/en-US/op1/
  locale/en-US/op1/op1Overlay.dtd      (locale/en-US/op1Overlay.dtd)
  locale/en-US/op1/op1.dtd             (locale/en-US/op1.dtd)
  locale/en-US/op1/a11yFirstStep.properties (locale/en-US/a11yFirstStep.properties)