I Have Windows Shared Hosting, and I Want to Allow PDF Files as an Attachment to Emails. Do I Need to Install any PHP or ASP Support Application for the Same?

No, there is no need to install or set up any application to use PDF files as email attachments. However, the ways are different to specify PDF attachments in your script as it depends on the mail function (PHP mail (), PHPMailer, etc.) you use for emails.

If you want to generate PDF files using your PHP script, then you will have to use some special classes in your script. You can find more information with examples from this URL.