Tried your code here, same result.
Mine was extracted from CPAN pages, as I said - I just added the headers and the "MainLoop":
#!/usr/bin/perl
use Tk;
use Tk::BrowseEntry;
my $var;
my $mw = MainWindow->new();
$b = $mw->BrowseEntry(-label => "Label", -variable => \$var);
$b->insert("end", "opt1");
$b->insert("end", "opt2");
$b->insert("end", "opt3");
$b->pack;
$mw->Button(-text=>'Exit', -command=>sub{$mw->destroy})->pack;
MainLoop;
Don't know what's wrong. I've just tested it in a Solaris box and it worked fine. But I need to run it on Win32.
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