@echo off
REM 待复制的三个文件
set FileA="C:\Test\1.txt"
set FileB="C:\f.xlsx"
set FileC="C:\Test\2.png"
REM 几十上百个文件夹所在的目录
set TargetFolder="C:\Users\Administrator\Desktop"
for /f "delims=" %%i in ('dir /b /s /ad %TargetFolder%') do (
    echo %FileA% %FileB% %FileC% ---^> %%~i
    copy /y %FileA% "%%~i\"
    copy /y %FileB% "%%~i\"
    copy /y %FileC% "%%~i\"
)
pause