Code:
on *:text:!send*:*:{
if (!$2) {
.msg $nick No file specified
}
else {
var %a = 1
while %a <= $numtok($2-,32) {
if ($exists($gettok($2-,%a,32)) {
set %file $addtok(%file,$gettok($2-,%a,32),32)
}
inc %a
}
dcc send -c $nick %file
}
  


Code allows for multiple files separated with spaces, and checks to see if the file exists. Files must be in the main mIRC directory. Long filenames are not supported.

If you need long filename support and/or support for files to be in one or more locations, let me know and I'll see what I can come up with, but it will be more complex.