to do sequential numbers you'd need NT scripting ideally.

you can do it in batch but you have to set upa control file and have the batch file read+update the control file... its properly complex and a right pain in the arse...

i struggled enough to add dates to filenames, and sequential numbers are even worse!!!!

do a search for batch programming in google, there are some really good websites with examples that helped me a lot... might find an easier method than the one i know of