[zion87]

попробуйте так

Код:

@echo off
SetLocal EnableDelayedExpansion
for %%t in ("*.txt") do (
	set /a m+=1
	if !m! LSS 10 ren %%t name_00!m!.txt
	if !m! LSS 100 ren %%t name_0!m!.txt
	if !m! LSS 1000 ren %%t name_!m!.txt
)