@echo off &setlocal enabledelayedexpansion
set "dd=%date:~2,2%%date:~5,2%%date:~8,2%"
for /f "delims=" %%a in ('dir /a-d /b *.txt ^| findstr /v "B[0-9][0-9][0-9]"') do (
set /a num=!random!%%1000
ren "%%~a" "%%~naB%dd%!num!%%~xa"
)
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