make .bat (.cmd) file with this text:
FOR /D %%i IN (%*) DO call :pocedure %%i
exit
:pocedure
l2encdec.exe -e 121 "%~1"
move /y "*%~nx1" "%~dp1"
exit /b
and place near l2encdec. then drag and drop .utx
you will got encrypted copy of file. just rename and use.