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Which registry entry do I need to modify to change my window color from white (which kills my eyes) to light gray (200, 200, 200)?

I've tried several, including:

  • HKEY_CURRENT_USER\Control Panel\Colors\Window
  • HKEY_CURRENT_USER\Control Panel\Colors\Background
  • HKEY_CURRENT_USER\Control Panel\Desktop\Colors\Window

but none seems to have any effect.

window color

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  • you mean the Notepad background color? that's not the window color – phuclv Sep 24 '18 at 16:58
  • Notepad is just an example. Whatever it is called, which registry entry is it? – Danijel Sep 24 '18 at 17:13
  • I don't know, but if that option is available then it only affects apps that use the default textbox. Did you try restarting or logging out after setting those values? But looks like there's a duplicate: How to change default window background color in Windows 10? – phuclv Sep 24 '18 at 17:17
  • See if this works for you....superuser.com/a/949922/40928 – Moab Sep 24 '18 at 22:43
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    Use the first method: HKEY_CURRENT_USER\Control Panel\Colors\Window Restart your computer after changing the Value data. I have tested that on two different virtual machines and they all work. – S.Leon Sep 25 '18 at 2:19
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S.Leon is correct:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Control Panel\Colors]
"Window"="200 200 200"

Classic Color Panel is a handy tool for changing this and other system colour settings.

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  • And: restart is needed. – Danijel Jun 8 '20 at 7:51
  • And: 230 is better, 200 is too dark. :-) Restart again... – Danijel Jun 12 '20 at 9:24
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Annoyingly they took the feature that let you do this in Win7 out for Win10.

The closest I can think of would be to enable the "High Contrast" setting and then customize the colours to your preference. To do this go Control Panel -> Appearance and Personalisation -> High Contrast Settings.

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