Hi!

You want people to upload .mrc or .ini files to your bot and to be loaded automatically?
Well, it's quite UNSECURE... I recommend you to disable /run and /dll commands 1st as anyone can run malicious code (mIRC's Options > Other > Lock).
Then you'll have to turn on Auto DCC Get (mIRC's Options > DCC > Auto-get file)
and add a little remote:

on remoteuser:FILERCVD:*.mrc,*.ini:/load -rs $filename

Some code parsing to check for malware could be a "plus" if you do not trust "remoteuser" (read this thread )