Anonymous Monk,
Your approach seems fine if you only need to read the second line of each file, but you don't say if you will ever need to process the entire file. I am suggesting using Text::CSV_XS in that case, which also has the added bonus of properly handling imbedded delimiters if you run into that problem.

#!/usr/bin/perl -w
use strict;
use Text::CSV_XS;

my @files = qw(foo bar blah asdf);

for my $file ( @files ) {
    if ( File_Type( $file ) ) {
        print "Do something with $file\n";
    }
}


sub File_Type {
    my $file = shift;
    open (INPUT , '<' , $file) or die "Unable to open $file for readin
+g : $!";
    my $csv = Text::CSV_XS->new( {'sep_char' => ';'} );
    while ( <INPUT> ) {
        next if $. != 2;
        chomp;
        if ( $csv->parse($_) ) {
            my @field = $csv->fields;
            die 'Incorrect number of fields' if @field != 4;
            return $field[2] =~ /^\d+$/ ? 1 : 0;
        }
        else {
            print "Unable to parse: ", $csv->error_input, "\n";
            return 0;
        }
    }
}
[download]

I left most of your code intact as you probably have it that way for a reason.

Cheers - L~R