Is it possible change display setting in compability mode?

[arcsnim]

*compatibility -maximum character sorry
Hi , like i said i wanna change compatibility entry

after

is it possible? i mean changing reg entries or patching some files? it's very important for me
regedit HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
change 640 x 480 to 1024 x 768 doesn't work