Hot to create a sequencial number to my file?

[JVilar]

I´d like to start my recording with a sequencial number.
My file format is: REPLAY %hh-%mm-%ss and i´d like something: REPLAY %NN (%NN = SequenciaNumber),
is it Possbile?

 

[52rpm]

I'm also interse

 

[JVilar]

It´s automatic :)
if you put the name only "REPLAY", it puts the sequencial number:
REPLAY_
REPLAY_2
REPLAY_3
:)