How to transfer app files from PC to iPhone?

I'm talking about pirated.ipa (iPhone app) files.
I have spend 2 hours trying FileApp, DiskAid and some other programs to tranfer an.ipa file from computer to iPhone.
I don't wanna use Jailbreak.
Is there ANY way to do this?

Iphone apps must be installed through the appstore, this is why the iphone is so safe, all code is reviewed before it can be in the appstore.