[Foreigner]

shmel_sv@vk,

Код:

@echo off
setlocal

for /f %%i in ('sed -n "$=" file.txt') do (

	set /a "s=%%i/100"
	set "n=%%i"
	
)

set "cnt=10000"

for /l %%i in (1,%s%,%n%) do call:1 %%i
goto:eof

:1
set /a "cnt+=1"	
sed -n "%1,+%s% p" file.txt > split_%cnt:~-4%.txt"