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Here you are, this creates the two input files and you can test it. @echo off ( echo abc echo def echo ghi )>file1.txt ( echo abc123.txt echo def123.txt echo ghi123.txt )>file2.txt setlocal DisableDelayedExpansion < file2.txt ( for /F "delims=" %%a in (file1.txt) do ( set file2Line= set /...