On Windows 10 and using the Steam version of RA3 I'm unable to get any sort of confirmation window to pop up when trying to hook the game which suggests it's not working, however the checkmark is still present next to RA3 in the launcher which is strange. The game, however, will absolutely not launch while hooked however and doesn't even give any sort of error or such outside of the log file.
The log file reads:
----- C&C:Online Launcher Start -----
Game: Red Alert 3
Red Alert 3 Install Path: D:\Program Files (x86)\Steam\steamapps\common\Command and Conquer Red Alert 3\
Started game with: "RA3.exe "
Caught CREATE_PROCESS_DEBUG_EVENT from Red Alert 3. Detaching...
ERROR: game.dat process not found.
----
For note I've set the CnC launcher to run as administrator and the RA3.exe as well. No change.
Without using the CnC Launcher I can boot up the game just fine and play single player to my heart's content but was hoping to do a co-op run with a friend who's having the same issues as myself.