apang

@echo off
for /f "delims=" %%a in ('dir /a-d /b *.txt') do (
  (for /f "usebackq delims=" %%b in ("%%a") do (
    set/a n+=1&set str=%%b
    setlocal enabledelayedexpansion
    if !n! neq 4 (echo,!str!
    ) else (
      for %%c in (":!str:*:=!") do echo,!str:%%~c=!
    )
    endlocal
  ))>$
  move $ "%%a"&set "n="
)
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