The RCU file is located in the main directory of your IL-2 install. It can be edited using Notepad but as a precaution you should make a copy of it first.
This is the default location.
(32 bit systems): C:\Program Files\Ubisoft\IL-2 Sturmovik 1946\rcu
(64 bit systems): C:\Program Files (x86)\Ubisoft\IL-2 Sturmovik 1946\rcu
If you still happen to have the game located in one of those default directories you should move it out of them onto your C drive.
IL-2 Sturmovik 1946 Patching Guide: http://www.mission4today.com/index.p...p=show&kid=584
In this Knowledge Base article at M4T there is an explanation about the RCU file and how to alter it.
Custom Icons:
http://www.mission4today.com/index.p...p=show&kid=681
Wheels