PropterHawk: Usually nothing. The "PLAY" button is greyed out and I cant even find a running game process. "Temple" flashes an errormessage for 1/2 a milisecond and it disappears before I can read it.
timppu: Temple of Elemental Evil isn't supported in Windows 10. Now you probably know why.
https://www.gog.com/game/the_temple_of_elemental_evil "Works on: Windows (7, 8)"
Also your GPU (Intel Graphics) may be a problem for some games.
Good to know though that it can be run also on Windows 10, even if it needs a third-party mod for that.
Anyway, generally speaking that is PC gaming for you. Lots of games and things don't (fully) work out of the box, especially when we are talking about running older games in Windows 10. Little tweaking is necessary here and there. Also for your claim that you never have similar issues in e.g. Steam, I claim that is because you don't try to play such problematic old games on Steam service, like you do on GOG. So you are comparing apples to oranges.
If you want a fully "works out of the box" experience, then your only option is either gaming consoles or streaming gaming services like Google Stadia, Microsoft StreamingGamingServicesMegaExperience, Amazon PlayAnywhereOhYeah! or Valve's upcoming SteamStreamHahaGedit?.
Then again, those options give you less freedom compared to PC gaming (like the ability to play old games, or even games originally made for completely other platforms), but those are the choices you have.
When it comes to (older) GOG games, generally they work much better out of the box on my Windows 7 PC, and quite often need something to work on Windows 10. Some examples (these work out of the box on Windows 7 IIRC):
Icewind Dale 2: in Windows 10 I need to use "ddwrapper" with the game, otherwise the scrolling would be very jerky and there would be some graphics problems like the well-known "jaggy fog of war"-bug. I wouldn't be surprised you still have these issues too, even if you think the game is running "fine". (dgVoodoo2 might work just as well, as ddwrapper)
Might & Magic 9: I need to use dgVoodoo2 with the game, otherwise I can't see anything underwater.
Two Worlds Epic Edition: The intro videos etc. are missing in Windows 10, on Windows 7 they play fine. I am quite sure the Steam version has this issue too, unless it has been just fixed.
Thank you! And yeah. I must have just seen a "windows icon" and figured it had to be backwards compatible with 10. I abhor Win 10 (but need it for business). It has some benefits (like better core usage), but I hate the SAS model.
PropterHawk: So far, Ive not had ONE game work "out of the box" ...
IXOXI: Many GOG games are broken due to bad galaxy integration needing response, that you are either online or offline… From this reason try turn off firewall. I had many problems, before I found it out!
Update: Some old games also need DEP turned off in system setting for them.
Running Dragon Age direcctly from the directory in compatability mode worked. I actually have Dragon Age through the EA Origin app (on a different PC), but I'd rather use GOG.
Maxvorstadt: Hm, I se that you`ve played more than 100 hours in two games of the five you own. So at least 40 % of your games work. That`s not "none of the games work"
GameRager: Well he DID say in the edit that some games work....likely he jumped the gun and typed it out in the heat of the moment(at least I am hoping that's what occurred here). Now as to WHAT games he means....well, that's why OPs should stick around a bit to see if they get any replies when making threads.
The one that caused my baffling rage was Dragon Age (since I wouldn't consider it retro); I found work-arounds for Icewind dale & ToEE (so I was able to get them to work, but they didn't work as downloaded) ... from other replies, it seems some of the issue lies with the GOG Galaxy front-end.
Maxvorstadt: Hm, I se that you`ve played more than 100 hours in two games of the five you own. So at least 40 % of your games work. That`s not "none of the games work"
Those worked only after using 3d party work-arounds ... surprisingly, the only one that DID work was Icewind Dale (which is not supposed to run on Win 10).