I have a copy of X2 Producer and a copy of Standard X3.  Is it possible to bring Prochannel from X2 Producer to X3?
Where are the files located on the computer and is possible to bring them over?

X3 Studio and X3 Producer have the ProChannel. The basic version of X3 does not. If you have X3 Studio, perform an advanced install of X2 Producer to get the ProChannel modules. IIRC, the ProChannel modules are part of the actual X2 Producer program install so deselect everything else in the advanced install screen. You also may want to apply the X2a patch as it might have updated the ProChannel modules.

I don't think the non-Studio or non-Producer X3 version has the ProChannel, just Studio and Producer do. AFAIK: ProChannel is not a plug-in so you can't use the one from X2 Producer in X3 standard.