How about taking advantage of :

"Options can take multiple values at once, for example...
This can be accomplished by adding a repeat specifier to the option specification.
Repeat specifiers are very similar to the {...} repeat specifiers that can be used with regular expression patterns
.... It is also possible to specify the minimal and maximal number of arguments an option takes.
foo=s{2,4} indicates an option that takes at least two and at most 4 arguments.
foo=s{,} indicates one or more values; foo:s{,} indicates zero or more option values."

#!/usr/bin/perl
use strict;
use warnings;
use Getopt::Long qw (GetOptions);

my (@Files);

Getopt::Long::Configure("no_ignore_case", "prefix_pattern=(--|-|\/)");
GetOptions ("file=s{,}" => \@Files);
    
foreach (@Files) {
    #Do stuff with file
    print "$_\n";
}
[download]