JDK-Info:
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java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b51)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b51, mixed mode)


Operating System:
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Generic


Steps to Reproduce:
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1) Install jre
2) Clean cache (\rm -rf ~/.java)
3) Launch Java ControlPanel
4) Click on "Settings..."
5) Click on "Change..." to change the cache location

When "Files of Type:" is chosen as "All Files", all files are not listed. Only folders are listed; whereas in the following case, choosing "All Files" lists all files and folders

JCP --> "Security" tab --> "Certificates" --> "Trusted Certificates" --> Import --> choose "All Files" for "Files of Type:"