How to read full name of a file with SdFat

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although sdfat use short names files , directories (8.3 format), long name registered in memory of card.
i sure there way read long name, using low level routine.
any body had that, know how or know can information it?

note: use arduino due, think not revelant purpose.

i 2 pages explaining vfat (virtual fat) long file name:
https://en.wikipedia.org/wiki/file_allocation_table
http://wiki.osdev.org/fat


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