[kiripanda]

Код:

@echo off
setlocal enabledelayedexpansion
set q=0
set N=0
for /F "delims=" %%i in (file.txt) do (
set /a q+=1
if !q! GTR !N! (
    set /a N+=1000
    md !N! 2>nul)
>>!N!\file.txt echo %%i
)