The easiest way is to use readdir together with stat and sort.
Something like this:
use 5.020;
my $dir = '\\\\server\\share\\my\\path';
opendir my $dh, $dir
or die "Can't opendir '$dir': $!";
my @files = map { "$dir\\$_" } # convert filenames to absolute filen
+ames with UNC path
grep { !/^\.\.?\z/ } # ignore "." and ".."
readdir( $dh );
my %last_modified = map { $_ => -M $_ } # cache the last modified time
@files;
@files = sort { $last_modified{ $a } <=> $last_modified{ $b } } @files
+;
say $files[0];
Update: Ignore . and .. entries, spotted by Marshall
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