How to bring back round window corners on Windows 10?

Solution 1:

The answer would be using the "hidden" aero-lite theme.

Quoting from Sergey Tkachenko at the link provided:

Similar to Windows 8, the brand new Windows 10 comes with a secret hidden Aero Lite theme, which can be enabled with just a simple text file. It changes the appearance of windows, the taskbar and also the new Start menu.

Instructions at http://winaero.com

Here is a (not very informative) discussion about the removal on answers.microsoft.com.

Solution 2:

If you have a bit of a budget then there is Windowblinds for custom themes. However programs that don't have a standard title bar like Mozilla Firefox and Google Chrome can be a bit tricky to get working with it. If all your programs have standard title bars then it is compatible with Windows 10.