Quote Originally Posted by phly95 View Post
Zelda Classic on Windows 10 seems to not work in fullscreen mode unless using a program called DXGL. Is anyone else having this issue and is there a way to fix it for newer versions of Windows?
Windows 10 (and also Windows 8/8.1) only support 32-bit color. The reason DXGL works is because it advertises 8, 16, and 24-bit color modes even if the version of Windows doesn't support them, and fully emulates the low-color modes.

Without DXGL, you can attempt to make Windows emulate 8-bit color (which is what ZC uses) by right clicking on zelda-w.exe and selecting Properties. In the Compatibility tab check "Reduced color mode" and from the dropdown make sure "8-bit (256) color" is selected.

If this works, it should also work on Windows 8 and 8.1, however there may be a severe loss of performance due to a DirectDraw bug in those versions. DXGL is not affected by this bug though because it uses OpenGL in 32-bit color mode.