Thanks for that. I did try the Perl in the link but sadly I did not have the required Win32::DriveInfo.
However I did use your google search and found a page which explained where the drive letters are in the registry.
The following Perl gives what I wanted.
It works for XP but I do not know about other Windows OS

use strict "vars";

my (%dletters, $return_code, $return_message, $jl);

sub drive_letters_find($$$) {
##-------------------------------------------------------------------
## this gets the drive letters and their paths for the current PC
# it returns a has where key is drive letter - value is it contents
## ------------------------------------------------------------------

my ($ref_dletters, $ref_return_code, $ref_return_message) = @_;

my ($pp, $k, $key, $vals, $CurrVer, %vals);

use Win32::Registry;

$pp = "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Map Net
+work Drive MRU\\";

$$ref_return_code = $main::HKEY_CURRENT_USER->Open($pp, $CurrVer);

if($$ref_return_code == 1) {

    $$ref_return_message = 'drive letters found';

    $CurrVer->GetValues(\%vals);
    foreach $k (keys %vals) {
        $key = $vals{$k};

        $ref_dletters->{$$key[0]} = $$key[2];
    }    
} else {

    $$ref_return_message = "Could not open regsitry $pp\n\n";
    
}

}

drive_letters_find(\%dletters, \$return_code, \$return_message);

print "\nafter drive_letters_find\nresult code <$return_code> message 
+<$return_message>\n";
if($return_code == 1) {
    print "mapped drive letters found\n";
    foreach $jl (sort {$a cmp $b} keys %dletters) {
        print "letter <$jl> path <$dletters{$jl}>\n";
    }
}
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