apang

@ECHO OFF & SETLOCAL EnableDelayedExpansion
set "s=abcdefghijklmnopqrstuvwxyz1234567890"
FOR /f "delims=" %%f IN ('DIR /B *.zip') DO (
    set "pas="
    for /l %%a in (1 1 4) do (
        set /a n=!random! %% 36
        for %%b in (!n!) do set "pas=!pas!!s:~%%b,1!"
    )
    MOVE "%%f" "%%~nf_!pas!.zip"
)
pause
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