@echo off
setlocal enabledelayedexpansion
set file=
set /p file= 請輸入要操作的文件名稱(包括擴展名)：
set "file=%file:"=%"
for %%i in ("%file%") do set file=%%~fi
echo.
set replaced=
set /p replaced= 請輸入即將被替換的內容：
echo.
set all=
set /p all= 請輸入替換字符串：
for /f "delims=" %%i in ('type "%file%"') do (
set str=%%i
set "str=!str:%replaced%=%all%!"
echo !str!>>"%file%"_tmp.txt
)
copy "%file%" "%file%"_bak.txt >nul 2>nul
move "%file%"_tmp.txt "%file%"
start "" "%file%"