Files automatically overwritten...

I'm trying to extract an FSB wich contain some duplicated name...

So if i have 5 time DUPLICA1.OGG i got only 1 file and not 5 with a number ex:

DUPLICA1.WAV
DUPLICA1-2.WAV
DUPLICA1-3.WAV
DUPLICA1-4.WAV
DUPLICA1-5.WAV

How i can extract all the 1275 files and not the half 700 because of that conflict?

Thank