its your windows specific problem, most prolly .bin file isn't defaulted as executable - you can run assoc command in cmd and check if says .bin=exefile
more on that: https://www.maketecheasier.com/change-file-associations-windows10/
but in your case, you can run l2.bin via cmd file to avoid that problem at all (my previous post), just keep in mind use of IP= argument can be disabled in l2.ini, also not sure if its even available in older chronicles, used it on GOD+ clients only.