antwan, welcome to
RP.
i'm not familiar with IP or the other. are these programs or parts of a program?
you might want to try IrfanView. it's free and can probably do what it is you're trying to do. it sounds like a batch processing resizing thing and i'm fairly sure irfanview can do that.
and i'm also curious why you want to make them 72 dpi resolutions. some reason for that?
and thanks, marthig

(give credit to doug nelson too; he got the thing, set it up and got the author to debug it a bit so we could use it)