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You will find below this improving version with Critical and Warning status:

@ECHO OFF
REM -------------------------------------------
REM - Version 0.4 - By briandent@redshift.com
REM - Original Version
REM -------------------------------------------
REM - Version 0.5 - By julienchpt@gmail.com
REM - ADD CRITICAL AND WARNING STATUS
REM -------------------------------------------
REM USAGE: check_user_count warn crit
REM warn: Number of session before warning
REM crit: Number of session before Critical
REM Example: check_user_count 2 4
REM -------------------------------------------
REM CALLING SEQUENCE:
REM command[nrpe_nt_check_users]=c:nrpe_ntpluginscheck_user_count.bat $ARG1$ $ARG2$
REM -------------------------------------------

set EX=0
set MS=OK
SET /a COUNT=0
FOR /f "TOKENS=1 DELIMS= " %%G IN ('query session ^|find "rdp-tcp#"') DO SET /a COUNT+=1

REM - CRITICAL (COUNT => $2)
if %COUNT% GEQ %2 ( set EX=2 && set MS=CRITICAL && goto end )
REM - WARNING (COUNT => $1)
if %COUNT% GEQ %1 ( set EX=1 && set MS=WARNING && goto end )

:end
ECHO %MS% Number of active sessions = %COUNT%
EXIT /b %EX%


Enjoy