Did you try the code above?

This is what I meant by minimal, working test app. I just cribed it out of that old program that used a RichEdit control. Supply it with a filename on the command line and it will:

1. Creates a main window containing a RichEdit control and both scrolbars.
2. Load the file.
3. Move the insertion point to the end of that file.
4. And scroll the window to show the last 10 line above the insertion point.
5. Sets the focus to the RichEdit control and displays the window.

It should be easy enough to add the relevant bits to your existing app.

#! perl -slw
use strict;
use Win32::GUI;

my $main = Win32::GUI::Window->new(
    -width => 800, -height => 600,
    -name => 'Main',
);
my $re = $main->AddRichEdit(
    -width => $main->ScaleWidth,
    -height => $main->ScaleHeight,
    -hscroll => 1, -vscroll => 1,
);

$re->Load( $ARGV[ 0 ]||die( 'No file' ), 1 );
$re->SetSel( ( $re->TextLength() ) x 2 );
$re->Scroll( 'bottom' );
$re->Scroll( -10 );
$re->SetFocus;

$main->Show();
Win32::GUI::Dialog();

exit;

sub Main_Resize {
    $re->Resize( $main->ScaleWidth, $main->ScaleHeight );
}
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