Wouldn't this work?

package GlobArgv;
use strict;
my $file = ();
my $line = ();
@ARGV = map { glob } @ARGV;
1;

foreach $file(@ARGV) {

my $string;

$/ = "";

foreach ($file) {
         open (FILE, $_);
         $string = <FILE>;
         close FILE;

         $string =~ s/\r\n/\n/sig;
         $string =~ s/\r/\n/sig;

         open (FILE, ">$_");
         print FILE $string;
         close FILE;
}
rename ($file, "$file.txt") or die "can't rename $file: $!";
print "process completed for: $file \n";
2;
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