[megaloman]

Прямолинейный, но удобочитаемый вариант

Код:

@Echo Off

Set Log=D:\file.log
del "%Log%"

Call :FindF "C:\" "Subst.exe"
Call :FindF "C:\" "Append.exe"
Call :FindF "C:\" "Attrib.exe"

GoTo :Eof

:FindF
FOR /F "usebackq delims=" %%i IN (`Dir "%~1%~2" /s /b`) DO echo %%i >>"%Log%"