The DCC Protocol, mIRC and especially the Resume part of the DCC protocol do not handle very large files all that well (usually). None of them were designed for that purpose solely in mind. In theory it should be fine, but in practice, as we continually see, large files do not get handled very well for a lot of people.
At the end of the day, mIRC isn't a file trading program and very very few people will be 'downloading' legitimate 700MB files. I hope you know downloading mp3s, movies and software is highly illegal and makes you liable for very heavy fines.
You could use the Search feature and search for 'DCC Resume'. Expand to 'All Forums' and 'All Posts' for best results. Many threads have been started about DCC resume.
Regards,
