[Petya V4sechkin]

Код:

setlocal enabledelayedexpansion
for /f "skip=1 tokens=1,2 delims=|" %%i in (%1) do (
     for /f "delims=" %%k in (%%i.txt) do (
          something.exe %%k %%i
          echo !errorlevel!
     )
)

EnableDelayedExpansion - позднее связывание.