Advertise an executable - (program - application) for PC

Hello guys. I want to ask you a question.
It's possible to monetize a .exe with ads? For example uTorrent or Skype haves it.
There's a friend that will be happy to know if there's a method to do a thing like this because he haves a big Warrock Private Server
and will be glad to earn some good money.
Thanks for any replies!
:beach2:

Yes. Some networks allow placement of their ad codes inside software, but you need to obtain their permission for it.

Wania said:

Yes. Some networks allow placement of their ad codes inside software, but you need to obtain their permission for it.

Click to expand...

That's good. So he have to ask them the permission. What kind of network he need?