[megaloman]

Код:

@Echo Off
cls
	Set "BoxIn=Z:\Box_In"
	Set "Mask=CONS#*_??????.USR" 

	FOR /F "usebackq tokens=2 delims=_." %%n IN (`2^>nul Dir /B /A:-D "%BoxIn%\%Mask%"`) DO Echo %%n
Pause
Exit /B

Первый вариант предпочтительнее, остальные, ИМХО, хуже

Код:

@Echo Off
cls
	SetLocal EnableExtensions EnableDelayedExpansion

	Set "BoxIn=Z:\Box_In"
	Set "Mask=CONS#*_??????.USR" 

	FOR /F "usebackq tokens=2 delims=_." %%n IN (`2^>nul Dir /B /A:-D "%BoxIn%\%Mask%"`) DO (
		Set "NN=%%n"
		Echo !NN!
	)

	EndLocal
Pause
Exit /B

Код:

@Echo Off
cls
	SetLocal EnableExtensions EnableDelayedExpansion

	Set "BoxIn=Z:\Box_In"
	Set "Mask=CONS#*_??????.USR" 

	FOR /F "usebackq delims=" %%n IN (`2^>nul Dir /B /A:-D "%BoxIn%\%Mask%"`) DO (
		Set "NN=%%~nn"
		Set "NN=!NN:~-6!
		Echo !NN!
	)

	EndLocal
Pause
Exit /B

Код:

@Echo Off
cls
	SetLocal EnableExtensions EnableDelayedExpansion

	Set "BoxIn=Z:\Box_In"
	Set "Mask=CONS#*_??????.USR" 

	FOR /F "usebackq delims=" %%n IN (`2^>nul Dir /B /A:-D "%BoxIn%\%Mask%"`) DO (
		Set "NN=%%~nn"
		Set "NN=!NN:*_=!
		Echo !NN!
	)

	EndLocal
Pause
Exit /B