anyway to change to a windowed mode in red alert 2

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 🙂