I was not requesting help for illegal filesharing, i was just asking for a new DCC send feature, which I think would be really useful.
Assign a random session number to a File/(Nickname/ID/IP) string pair, so if the file was not sent succesfully, the sender client should still remember the session, if "Auto Resend" is selected, and the one who requests the file has the previous nickname/ID or IP (to prevent "strangers" from requesting a certain file)
And another feature: think of a way for mIRC to prevent using "resume" on a different file from the original. I suppose it should send filesize (or MD5 signature) to the reciver, to recognise if it's an identical file.
