I am a windows user because no one helps me wif the hackintosh stuff xD

I have an [MC] iPod touch 2G and I would like to make a custom ipsw file that contains a modded Preferences.app and SpringBoard.app (to add battery % and usage menu). I cannot open the DMGs inside the package (I have HFSExplorer) because it has some sort of password.

Is this possible without jailbreaking the IPSW?