Removing curled corners and thick shadows from some apps

Some applications under Windows 11 use curled corners and big shadows even when running under Windows Classic theme.

These include Telegram Desktop and FileLocator Lite.

I found that this can be mitigated either by

* Setting compatibility layer to Windows 8 on the compatibility tab.

or

* Setting the compatibility layer to Win8RTMVersionLie via registry (it is less invasive than Win8RTM layer)

or

* Setting the global environment variable __COMPAT_LAYER with value Win8RTMVersionLie:



The later will affect all programs.

P.S. It seems, Telegram Desktop is affected only by user's (not system's) environment configuration.