@echo off
cd /d "%~dp0"
set "OldFile=123.txt"
set "NewFile=3.txt"
set "NewFolder=一二三"
setlocal enabledelayedexpansion
for /f %%i in ('type "%OldFile%"') do (
    set "StrLen=0"
    for /f "skip=1 delims=:" %%a in ('^(echo "%%i"^&echo.^)^|findstr /o ".*"') do set /a StrLen=%%a-5
    if !StrLen! equ 9 (
        if not exist "%NewFolder%" (
            md "%NewFolder%"
        )
        copy /y "%NewFile%" "%NewFolder%"
    ) else if !StrLen! equ 4 (
        >>"%NewFile%" echo,ABC
    ) else if !StrLen! equ 3 (
        >>"%NewFile%" echo,12345一二三
    )
)
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