[megaloman]

Код:

@Echo Off
cls
	Set "FileTxt=Z:\Box_In\Пусть простой текстовый файл.txt" 
	Set "BoxIn=Z:\Box_In"
	Set "Ext=jpg"
	Set "BoxOut=Z:\Box_Out"

	For /F "usebackq delims=" %%f In (`2^>nul more "%FileTxt%"`) Do (
		If Exist "%BoxIn%\%%f.%Ext%" (
			Echo Copy "%BoxIn%\%%f.%Ext%" "%BoxOut%\"
			>nul Copy "%BoxIn%\%%f.%Ext%" "%BoxOut%\"
		) Else (
			Echo ???? File "%BoxIn%\%%f.%Ext%" not found
		)
	)
pause
Exit /B