RewriteEngine on

RewriteRule /overview/(.*) /xyz/?action=overview;$1
RewriteRule /one/([0-9]+)/(.*) /xyz/?action=one;id=$1;$2
RewriteRule /two/([0-9]+)/(.*) /xyz/?action=two;id=$1;$2
RewriteRule /download/(.+)/(.*) /xyz/?action=download;file=$1;$2

##</code><code>##

package TransHandler;
use warnings;
use strict;
use Apache::Constants qw(DECLINED);
sub handler {
    my $r = shift;
    my $uri = $r->uri();
# ... shortened
    elsif ($uri =~ m|^/one/(\d+)/|) {
        $r->uri("/xyz/Handler.pm"); return DECLINED;
    }
# ... shortened
    return DECLINED;
} # handler

##</code><code>##

$r->uri("/xyz/Handler.pm?action=one;id=$1");

##</code><code>##

Filename is not valid: ...... Handler.pm?action=one;id=20