soundSet = { name = "bus_modern", horn = "vehicle/truck_modern/horn.wav" }
id = "vehicle/bus/citaro/lod_0_w2.msh",
"vehicle/bus/berkhof_duvedec/berkhof_duvedec_lod_0_w2.msh", "vehicle/bus/berkhof_duvedec/berkhof_duvedec_lod_0_w3.msh", 

open $filehandle, "<", $file or die "can't open $file\n";
while (<$filehandle>)
{  
my $line=$_;
my $count=0;
$count++ while ($line =~ m/\//g);
            # looks like we found a file-reference
            if ( $count > 1) 
            { 
                # remove all whitespace now

                # prefix whitespace
                $line =~ s/^\s+//;

                # suffix whitespace
                $line =~ ~ s/\s+$//;

                # intermediate whitespace
                $line=~ s/ //g;

                # remove everything until first occurance of "
                $line=~ s/[^\"]*\"//;

                # chop off all chars after "
                my $oper = index($line, '"');
                my $word = substr($line, 0, $oper);
                $line=$word;

                # putting it together
                # buildpath returns a complete path & filename depending on wich prefix is 
                # used for the current file

                my $searchfile=buildpath($line);
                if ( -e $searchfile )
                {
                    pdebug(1,"found\n");
                }
                else
                {
                    pdebug(1,"not found\n");
                    print "\nunmatched reference in file:\n$file\n";
                    # findline prints the Linenumber of a string in a file
                    findline($file,$line);
                    print"\ncouldn't find file:\n       $searchfile\nreferenced as:\n$line\n";

                }
            }
}