Код:

@echo off
set "word_or_frase=Bye!"
set "replacement=Hello!"
for %%i in (
"example_1.txt"
"example_2.txt"
"example_3.txt"
) do (
echo WScript.Echo^(Replace^(WScript.CreateObject^("Scripting.FileSystemObject"^).OpenTextFile^(%%i^).ReadAll^(^),"%word_or_frase%","%replacement%"^)^)>.vbs
cscript //nologo .vbs| clip
mshta "vbscript:CreateObject("Scripting.FileSystemObject").GetStandardStream(1).Write(ClipboardData.GetData("text"))&Close()"| more>%%i
)
del .vbs
exit /b