Generating multiple Exe with the launcher

This would be a bit different from LibreOffice if it was automatic as I suggested above. You'd set the ProgramExecutable within your launcher.ini to App\AppName\Binaries\Win64\App.exe and then swap between the two binaries using a custom.nsh for the launcher. It'd look like this:

${SegmentFile}

${SegmentInit}
	ReadRegStr $2 HKLM "Software\Microsoft\Windows NT\CurrentVersion" "CurrentBuild"
	
	${If} $2 < 10000 ;Windows 7/8
		${If} ${FileExists} "$EXEDIR\App\AppName\Binaries\Win64\App_DX12.exe"
			Rename "$EXEDIR\App\AppName\Binaries\Win64\App.exe" "$EXEDIR\App\AppName\Binaries\Win64\App_NoDX12.exe"
			Rename "$EXEDIR\App\AppName\Binaries\Win64\App_DX12.exe" "$EXEDIR\App\AppName\Binaries\Win64\App.exe"
		${EndIf}
	${Else}
		${If} ${FileExists} "$EXEDIR\App\AppName\Binaries\Win64\App_NoDX12.exe"
			Rename "$EXEDIR\App\AppName\Binaries\Win64\App.exe" "$EXEDIR\App\AppName\Binaries\Win64\App_DX12.exe"
			Rename "$EXEDIR\App\AppName\Binaries\Win64\App_NoDX12.exe" "$EXEDIR\App\AppName\Binaries\Win64\App.exe"
		${EndIf}
	${EndIf}
!macroend

So, on Windows 10/11, it'll look to see if App_DX12.exe exists and rename it to App.exe so that'll get used while renaming the existing App.exe to App_NoDX12.exe. And on Windows 7/8 it'll look to see if App_NoDX12.exe exists and rename it to App.exe so that'll get used while renaming the existing App.exe to App_DX12.exe.