I'm not understanding fully, sorry. Could you try elaborate on what the problem is - i.e. what is the "command line" you refer to - are you trying to download using XDCC bots or Fserves? (No, I'm not going to lecture you, it's a legitimate use it would seem!).
Might also help to know what mIRC version you're using, what Operating System you're using and any other info you may think is relevant.
Regards,
