From the amazing Farhan Kazi:

http://fkazi.blogspot.com/2013/07/export-active-directory-groups-with.html

@ECHO OFF
SETLOCAL EnableDelayedExpansion

SET FileName=Report.csv
SET AG=0
SET EG=0
SET CT=0
SET NE=0
SET GN=

FOR /F %%T IN ('DSQuery * -Filter "(&(objectClass=Group))" -Limit 0') DO SET /a AG+=1 >NUL
FOR /F %%T IN ('DSQuery * -Filter "(&(objectClass=Group)(^!member=*))" -Limit 0') DO SET /a EG+=1 >NUL
SET /a NE=!AG!-!EG!

ECHO Total Groups in Active Directory %AG% out of them %EG% are empty.&&ECHO.
ECHO Group,Members>"!FileName!"
TITLE Exporting !NE! Non-Empty AD Groups.

FOR /F "delims=" %%G IN ('DSQuery * -Filter "(&(objectClass=Group)(member=*))" -Limit 0') DO (
    FOR /F "delims=" %%v IN ('DSQuery * %%G -l -q -Attr Name -Limit 0') DO SET GN=%%v
    SET /a CT+=1 >NUL
    ECHO !CT!. Exporting: !GN!
    FOR /F "delims=" %%M IN ('DSGET Group %%G -Members') DO (
        FOR /F "delims=" %%U IN ('DSQuery * %%M -l -q -Attr displayName') DO (
        ECHO !GN!,%%U>>"!FileName!")))

TITLE Export complete.
ECHO.&&ECHO Export complete, please check '!FileName!' file.
EXIT /B 0

Here’s a mod, which creates one file per group:

REM
REM Export all Active Directory groups to CSV files
REM One CSV file per group
REM
REM Original written by Farhan Kazi
REM http://fkazi.blogspot.com/2013/07/export-active-directory-groups-with.html
REM
REM Modded for one file per group by Jonathan Brickman
REM http://n.ponderworthy.com
REM

@ECHO OFF
SETLOCAL EnableDelayedExpansion

SET AG=0
SET EG=0
SET CT=0
SET NE=0
SET GN=

FOR /F %%T IN ('DSQuery * -Filter "(&(objectClass=Group))" -Limit 0') DO SET /a AG+=1 >NUL
FOR /F %%T IN ('DSQuery * -Filter "(&(objectClass=Group)(^!member=*))" -Limit 0') DO SET /a EG+=1 >NUL
SET /a NE=!AG!-!EG!

ECHO Total Groups in Active Directory %AG% out of them %EG% are empty.&&ECHO.
TITLE Exporting !NE! Non-Empty AD Groups.

FOR /F "delims=" %%G IN ('DSQuery * -Filter "(&(objectClass=Group)(member=*))" -Limit 0') DO (
    FOR /F "delims=" %%v IN ('DSQuery * %%G -l -q -Attr Name -Limit 0') DO SET GN=%%v
    SET /a CT+=1 >NUL
    ECHO !CT!. Exporting: !GN!
    FOR /F "delims=" %%M IN ('DSGET Group %%G -Members') DO (
        FOR /F "delims=" %%U IN ('DSQuery * %%M -l -q -Attr displayName') DO (
        ECHO %%U>>"!GN!".CSV)))

TITLE Export complete.
ECHO.&&ECHO Export complete.
EXIT /B 0