By default mIRC only have Auto DCC Get file and not Auto DCC Send, but its possible do that feature using mIRC Scripting! i think!
But it makes no sense, how the people know what you have to give, or even, you know what people want from you?
Exist a lot of approchs for this question, you can share your things in one folder and make people search by files, but that is File Sharing and we cannot help you with that!
Thats all
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