PHP to download PDF throws error
===

I have a PHP file to force download a PDF file, on one server (linux) it worked fine, but when I moved the site to another server (Win) it started to give this error:

    PHP Warning:  readfile(./forms/Form.pdf)
    [<a href='function.readfile'>function.readfile</a>]:
    failed to open stream: No such file or directory in
    D:\CustomerData\webspaces\webspace\wwwroot\Form.php
    on line 4

The PHP file has this:

    <?php
    header('Content-disposition: attachment; filename=./forms/Form.pdf');
    header('Content-type: application/pdf');
    readfile('./forms/Form.pdf');
    ?>

Thanks!