In D3852#149748, @Sergey Sharybin (sergey) wrote:

• Find a proper common term for fluids and smoke.

Just like @Juan Gea (juang3d) said, fluid seems to be the correct word for both, according to Oxford dictionary:
https://www.lexico.com/en/definition/fluid

A substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid.

Yes, it does work correctly from Windows Explorer directly; probably they do work around the issue with the filesystem directly which is easier as an OS.

The renaming between File and file is working in explorer I see. But an application asking Windows to rename File to file still won't work.
You can see that Windows doesn't see the difference between 'test' and 'Test' in this screenshot, where I already have a file 'test', then when I rename another file to 'Test' (with a capital), Windows throws this up:

This is a core issue with Windows. Try the same steps in Windows Explorer and you'll notice the same behavior.

To clarify, Eevee's reflection plane preview does already conform to the "Display overlays" viewport toggle. But in Unreal the "game view" toggle is bound to "G" by default and its widgets usually are more intrusive so most become very used to toggling it back and forth constantly.
Just to experiment, I bound a shortcut key to the "Display overlays" and noticed I started using it a lot within moments.

In the Unreal engine, the "Planar Reflection" object behaves the same. In Unreal the property is called "Show Preview Plane". For Eevee the property should probably at least be renamed to that too, I couldn't come up with a property name that's more idiomatic to Blender than "Show Preview Plane" already is.