Batch file converting, Stp to IGS, need some help

Hi all,
Just trying to find a way to convert Stp files to IGES in rhino.
Have many individual Stp files and it takes some time opening each one to save or export as IGES so would be cool to have a way to select a fold of them and rhino output them all in IGES.
I have not found in the form what im looking for so even if you can make the script im happy to pay depending on how much its going to cost.