$a = "Line1\r\nLine2";
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New here: is it proper to say thank you? Thank you.

Windows text files store returns as a combination of two characters, character 13 then 10. (Which is conveniently represented as "\r\n" on that platform.) Perl is from Unix, which is used to using a single character, character 10 (ie "\n") for a line ending. For the sake of portability, Perl does this conversion by default when reading or writing files (you can use binmode to turn this conversion off). However the Win32::Clipboard module does not do this conversion.

Therefore returns in Windows come in through the clipboard as "\r\n". And many programs will want to see them come back as "\r\n" as well. Some can work around it, but others cannot. If doing this escaping yourself sounds like too much of a bother, you can do this:

# Like Get but handles incoming returns
sub Win32::Clipboard::GetEsc {
  my $self = shift;
  my $text = shift;
  $text =~ s/\r\n?/\n/g;
  $self->Get($text);
}

# Like Set but escapes outgoing returns.
sub Win32::Clipboard::SetEsc {
  my $self = shift;
  my $text = shift;
  $text =~ s/\r\n?|\n/\r\n/g;
  $self->Set($text);
}
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Thank you.