What is "Export PDUs to File..." intended to do?

[Guy Harris <guy () alum mit edu>]

Currently, it writes something to a temporary file, and then closes the current file and reads the new file in.

1) What do the four choices it offers mean?  I tried it with "OSI Layer 3" on an HTTP capture and no packets were 
written.

2) Why does it replace the current capture, rather than writing out to a new file with a specified name?  That's not 
what I'd expect a menu item that begins with "Export" to do.
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