How about a more direct statement, then?
mIRC is not meant for sharing illegal files and because that is the most common method of sharing files, we cannot support that feature in the official forums. For help, seek out other forums or ask in the channel(s).
Besides, anything that is related to channel rules/requirements or related to what another user is doing should be directed to that channel or user. They can help much more easily that we can. For all we know, that channel may not use what are considered standard commands for the servers. A question there that takes a few minutes solves the problem in less time than a question here that can take anywhere from a few minutes to a few days depending when it's asked and how many people are around to answer.
Also, the fact that you are in the channel and especially the fact that you are downloading something already tells everyone there anything they need to know about your downloading habits (legal or otherwise). Not talking doesn't offer you any "protection."
