Batcher

@echo off
for /r "D:\1\" %%a in (*.txt) do (
    type "D:\a.txt" >"%temp%\%%~na.tmp"
    type "%%a" >>"%temp%\%%~na.tmp"
    type "D:\b.txt" >>"%temp%\%%~na.tmp"
    move /y "%temp%\%%~na.tmp" "%%a"
)
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