Provided by: libsdl3-doc_3.2.28+ds-1_all 

NAME
SDL_UnregisterApp - Deregister the win32 window class from an SDL_RegisterApp call.
SYNOPSIS
#include <SDL3/SDL_main.h>
void SDL_UnregisterApp(void);
DESCRIPTION
This can be called to undo the effects of SDL_RegisterApp.
Most applications do not need to, and should not, call this directly; SDL will call it when
deinitializing the video subsystem.
It is safe to call this multiple times, as long as every call is eventually paired with a prior call to
SDL_RegisterApp. The window class will only be deregistered when the registration counter in
SDL_RegisterApp decrements to zero through calls to this function.
AVAILABILITY
This function is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.28 SDL_UnregisterApp(3)