Thanks James, I found your tool in EG forum by myself :-) It seems that my IR receiver is using MCE drivers, but EG is not working with it. So I was pushed to use software that came with remote. Thanks to your udpsender I managed to do what I wanted (almost). Remote software is minimizing XBMC while executing exe (there is no option to run exe silently, like in EG). I'm using now option in video section "use maximize rather than true fullscreen" but GUI is bit slower that way.
Thanks for help,
J.