Commander

@echo off
for /f "tokens=*" %%i in ('dir /b *.txt') do (
    ren "%%~i" "wwf%%~ni.txt"
)
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Commander

@echo off
for %%a in (*.html) do (
    set "file=%%a"
    setlocal enabledelayedexpansion
    ren %%a !file:~0,-9!.txt
    endlocal
)
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