In Windows LookAndFeel, the JFileChooser's Open button should have a sufix "(O)", after the fix of 6745408, it's gone. The fix should only affect MetalLookAndFeel, not WindowsLookAndFeel. See attached screenshot.
JDK-2179723Missing "(O)" in JFileChooser Open button in Windows LAF
JDK-6790849need seperate message for label text of open button in both basic and metal LookAndFeel