For normal  customer  Windows applications, the cancel button has no mnemonic. This is because "cancel" is usually handled by the escape key as opposed to a mnemonic.
 Likewise, "OK" has no mnemonic because it is the default button and handled by the enter key.

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Posted Date : 2005-09-12 19:43:49.0

N/A

I agree. The native Windows JFileChooser has no mnemonic. I recently turned down adding mnemonics to the JColorChooser's OK and Cancel buttons for the same reasons given in the description. These mnemonics should be removed from JFileChooser.
  xxxxx@xxxxx   2004-03-16

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Posted Date : 2005-09-12 23:05:02.0

The cancel button in the JFileChooser when running on Windows has a mnemonic. You can't see it by default but it's there when you hold down the Alt key.  Native Windows apps don't have a mnemonic on the cancel button because the Escape key is always mapped to cancel on most any dialog.  To fix this I have added a line to the windows.properties which sets the cancel button mnemonic to -1, which will remove the mnemonic at runtime.
Posted Date : 2005-09-12 23:05:03.0