[gora]

Код:

@Echo Off
SetLocal enabledelayedexpansion
Set src=C:\1234cv??.rar
Set out=C:\arhiv

For %%a In ("%src%") Do Call :_mov "%%a"
Exit

:_mov
For /L %%i In (0,1,99) Do (
	Set nb=0%%i
	Set nb=!nb:~-2!
	If Not Exist "%out%\1234rn!nb!.rar" (Move "%~1" "%out%\1234rn!nb!.rar" & GoTo :EOF)
)
GoTo :EOF