[EDIT: May '17 - Screen scaling has been returned to the graphics processor again with the 1703 update.
You can now run games that use a low res full screen, as was possible with earlier Widnows ]
[ EDIT: The issue with using a high DPI setting is no longer affecting my games since the 1511 Win10 update.
Note that this post was directed to nhmbtvt, and is not intended as a fix for Win10 having taken over screen scaling
from the graphics processor driver.
There is no 'fix' . The issue is due to a decision by MS to put screen scaling of phones, etc. over gamers desire
to force wide screen when using an in game resolution that is not native to the wide screen format.]
Most of the games with the DPI scaling issues will run if Compatibility mode is set to
Disable display scaling on high DPI settings, but some games do require you set Windows DPI to 100%.
- Some older games will not launch if a setting over 100% is used, and others, DOS based games in
particular, will launch but will not be properly centered on screen.
Win7 also has this problem with some games, but not nearly as many as does Win10.
.