I made a list of games on my account that are not officially supported by Windows 10.
Thought it would be worth making a thread.
All these games are not officially supported by Windows 10:

Divine Divinity
Legacy of Kain: Soul Reaver (there is a workaround)
Postal 2 (there is a workaround)
Tales from the Borderlands (there is a workaround)
Battle Realms + Winter Wolf
Unreal 2
Rainbow Six (there is a workaround)

Oddworld: Abe's Oddysee (there is a workaround)
Stronghold HD (there is a workaround)
Riven (Sequel to Myst) Real Myst
Unreal Tournament 2004 (there is a workaround)
Empire Earth
Wing Commander 3 Wing Commander 4
_

Feel free to add to the list!

EDIT: I have found that there are ways to get most of these games running. Just search the game name and Windows 10 to find the solutions.

Hello. Courtesy of mrkgnao and MaGOG, a complete list of games that aren't officially supported by Windows 10 can be found in the following link:
[url=http://www.an-ovel.com/cgi-bin/magog.cgi?ver=729&scp=gdspurio&dsp=ipgfsorlcmbaxyzXhDFGHTP0512348&ord=&flt=onn~w10~&opt=n&myf=TueMay100849522016_empty_7QTIww_zC9_y2]http://www.an-ovel.com/cgi-bin/magog.cgi?ver=729&scp=gdspurio&dsp=ipgfsorlcmbaxyzXhDFGHTP0512348&ord=&flt=onn~w10~&opt=n&myf=TueMay100849522016_empty_7QTIww_zC9_y2[/url]

It is interesting to say that while these games may not be officially supported on Windows 10, some games can run on Windows 10 with little to no tweaks required in order to play them. For instance, I was able to complete Pajama Sam 2 on Windows 10 with only installing the game from the GOG installer.

Some games might pain you just to get them running though. *points finger at Nox*

Don't be ridiculous Pooka, title clearly says: Games that are not officially supported by Windows 10.
I can run most of my windows games with just one click, but that doesn't mean they're supported by linux, does it? ; )

Lol. I acknowledged this.

Probably any game can be run on w10/linux with some tweaks. Depends how desperate one is I guess : D

Thanks for your help everyone.

I'm assuming at least a few of those games would work fine, but I was trying to compile a list of games that may have issues presently. Good to know there is a place where I can find more of that info.

I'm moving to Windows 10 in a couple of weeks and can probably confirm at that point if some of these games refuse to work in Windows 10 without serious troubleshooting.

Thought it was time to update and mention there were workarounds for all of my favourite titles on this list.
If anyone is having trouble feel free to contact me.