April 2015 - last edited November 2017
Technically this can be done by running the game with command line parameter "-win", but unfortunately, windowed mode only works when your desktop is switched to 16-bit colour mode... and I don't think modern Windows versions even support 16-bit colour for the desktop.
So, yeah, I don't think it can be done, but if you really do want to experiment with that, make sure to first install Bibber's fixed game launchers, since the default ones that come with TUC don't even pass the "-win" command line parameter on to the game when you set it in the game's Origin settings.
[edit]
Seems Win10 has "run in 16 bit color" in its compatibility options
April 2015 - last edited January 2022
It seems this dll fixes the 16-bit colour issue:
https://github.com/CnCNet/ts-ddraw/releases
This was originally made for Tiberian Sun, though, and apparently development on it was never truly completed, so there may be bugs. I talked to the developer, and they said that one of the known issues was that the click-areas of the buttons on the main menu won't get positioned on the actual buttons correctly, so you'll have to experiment a bit to get them clicked correctly.
Anyway. Full procedure should be:
-Install Bibber's fixed launcher for Red alert 2 / Yuri's Revenge
-Find the folder in which the game is installed, and put the ddraw.dll from the link above into it..
-In the Origin client, right-click the Red alert 2 / Yuri's Revenge item and open the game properties
-Make sure to disable the Origin In-Game option, and put "-win" in the "command line parameters" field.
That's it. Running the game now should give you.windowed mode.
November 2018
It works! but... I notice that in the menu, the button are now flashing like its constantly refreshing. Any ideas how to fix that?
January 2022
The link for the ddraw.dll fix download appears to be broken! (-_-)
Does anyone know where to find this file?
January 2022
January 2022
September 2022
I did everything here, and noticed the launcher open faster, but when I click yuri's revenge it open the window and then crashes, got any ideas?
May
I have this same problem - did you find a fix? I wonder if this has to do with the switch from Origin to the EA App.
June