Hi Balaji,
popABC deals with SNPs as sets of 0s and 1s. if you consider SNP's with only two states (even if state 0 (or 1) is the ancestor state and state 1 (or 0) are all the others) then you can use popABC.
The formats for the input files are .nex, .u, .txt or .pop in the examples folder.
Regards,
Joao