[Georgio]

Код:

@echo off

set "$m=%CD%"
set "$f=dir.txt"
set "mp=500"

(
for /f "delims=" %%a in ('dir/b/s "%$m%"') do @(
 set "b=%%~dpna"
 cmd/v/c echo.!b:~0^^,%mp%!%%~xa
)
)>"%$f%"