An example might be:
/copy " $+ $1- $+ " " $+ $mircdirexample $+ "All you'd then have to do is rename the file 'example' in your mIRC directory, or whatever directory you specified. You may like to use the ON FILERCVD event however for more flexibility (the text box in the that dialog has a character limit). See
/help ON FILERCVD.
As a note, mIRC isn't a file sharing program, incase that is what you were using it for

(We also don't help with that here).
Regards,