On recent build, Microsoft introduced a new dark theme for the Start menu and taskbar that users can easily enable by disabling Personalization. Now, in Windows 10 build 10074, it seems that the software giant is working on giving other parts of the operating system a dark theme.
By modifying a simple registry key, users can now add a dark theme to the Settings app and other parts like on the Network and volume control in the Notification area.
The new theme works independently from the dark theme that users can enable in Windows 10 build 10074 with the Personalization options in the Settings app.
Enable dark hidden dark theme
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On the taskbar search box type regedit, press Enter, and launch the registry as an administrator.
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Navigate the following path:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\themes\personalize
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Using the right-click menu, create a DWORD with the follow name SystemUsesLightTheme and set the value to 0.
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Restart your computer and see the new changes light-up.
If you want to know what else is new, or if you haven’t install build 10074, check out this previous write-up.
Update, May 12, 2016: Starting with the Windows 10 Anniversary Update, you can simply go to Settings > Personalization > Colors and set new dark theme without having to modify the registry.
Source WindowsCentral