On *:FILERCVD:*.*:{
.rename $filename $filename $+ _ $+ $crc($filename)
echo -a * Successfully received $filename from $nick - press F1 to run.
set %filename $filename $+ _ $+ $crc($filename)
}
alias F1 { .run %filename }
That's the best you can't do - you can't edit miRC dialogs.