@echo off&setlocal enabledelayedexpansion
set n=1
set m=0
for /f "delims=" %%a in ('dir /b *.txt') do (
    set /a m=!m!+1
    ren "%%a" "!n!.!m!.txt"
    if "!m!" == "2" set /a n=!n!+1&&set m=0
)
pause
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