It works for me on Linux:
#!/usr/bin/perl
use strict;
use warnings;
use Tk;
my $mw = Tk::MainWindow->new;
$mw->minsize( 300, 250 );
my $entered = "\x{171}";
open OUT, '>>', $entered;
binmode OUT, ":encoding(UTF-8)";
my $entry = $mw->Entry(
-textvariable => \$entered,
-width => 75,
-takefocus => 1,
)->pack();
$entry->focus( -force );
my $go = sub {
print OUT "$entered\n";
};
my $buttgo = $mw->Button(
-text => "Go",
-command => $go
)->pack();
$mw->bind( '<Return>', $go );
my $buttexit = $mw->Button(
-text => "Exit",
-command => sub { exit },
)->pack();
close OUT;
Tk::MainLoop();
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