[Georgio]

Код:

@echo off

>"result.log" (
for /f "delims=" %%i in ('2^>nul dir/a-d/b/s "*.txt"') do @(
 for /f %%j in ('^<"%%i" find/v /c ""') do @(
  if %%j lss 10 echo %%i
 )
)
)

exit/b