Your two posts are a bit confusing. You say you cant d/l off xdcc bots, then you say you can d/l various files types but not .rar or .tar. It isnt clear if its only certain file types you are having a prob with/ all files from a or all bot(s)/ Certain file types from a certain sender. Have you considered the sender may be the one with the prob? Some addon is at fault? Or do you just expect to give us a lil info and we will jump to make it easier for you to get an illegal file? At this point i have no clue what you are asking, only your justification of illegal filesharing (which implies the one you want comes under that heading).
There was no need to jump all over another poster for his reply to you. When you post on a public forum you accept the poss that you may not like what someone else says. We are here to help with mIRC specific probs, not to solve the probs of misconfigured bots whose sole purpose is generally to share illegal files or to support illegal filesharing. If you are having probs with a specific file type(s) or with how vanilla mIRC is reacting to them, thats one thing. If the bot sender is having a prob, or an addon has caused probs, that not something we can help with, nor do we want to. Just as you can do as you wish with your free time, so too can this forum and its users have a policy of not being illegal filesharing assistance central.
