With some help from you guys and some people at www.nntp.perl.org/group/perl.tcltk, I was able to get Drag and Drop to work from an external application (Windows Explorer) into my Perl/Tkx program. First I needed to get the tkdnd TCL files from sourceforge. Then, because of limitations on my work PC where we all have to use the same version of Perl, I could not install tkdnd, so I simply copied them to a directory on my drive (D:/dss/perl/tk/tkx/lib). Then, the following script works:

use strict;
use Tkx;

Tkx::lappend('::auto_path', 'D:/dss/perl/tk/tkx/lib');  # should be a 
+path everyone has
Tkx::package_require('tkdnd');

my $textVar = "drag here";

my $mw = Tkx::widget->new(".");
my $entry = $mw->new_entry(-name => ".current_dir", -textvariable => \
+$textVar);
$entry->g_pack(qw '-fill both -expand true');

Tkx::tkdnd__drop___target_register($entry,'*');
Tkx::bind ($entry, '<<Drop:DND_Files>>',  [ sub { AcceptDrop(shift); }
+, Tkx::Ev("%D")]);

Tkx::MainLoop;

sub AcceptDrop
{
    $textVar = shift;
    print "in AcceptDrop with '$textVar'\n";
}
[download]

Thanks for everyone's help!

Dave