I don't have ADO to test your code but here is a Win32::OLE alternative.

#!perl
use strict;
use Win32::OLE;
use Win32::OLE::Const 'Microsoft Access';

my $db_file =  "c:/temp/Hello.accdb";

my $app = Win32::OLE->new('Access.Application', 'Quit') 
  or die "Couldn't start new Access instance: $!";

my $db = $app->OpenCurrentDatabase($db_file) ;
my $db = $app->CurrentDb;
my $rs = $db->OpenRecordSet('
  SELECT Company_Code,Name FROM Plants
  ORDER BY Company_Code'
);

my $Plantfile = 'c:/temp/Plants.txt';
  
open OUT,'>',$Plantfile 
   or die "Could not open $Plantfile : $!";

my $count = 0;   
my @fields = ('Company_Code','Name');  
while ( ! $rs->Eof )
{
   my @cols = map { $rs->Fields($_)->Value }@fields;
   print OUT join "\t",@cols;
   print OUT "\n";
   $rs->MoveNext;
   ++$count;
} 
close OUT;
print "$Plantfile created with $count records\n";
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