"asp" stands for Active Server Pages. And, that's not how it works. ASP is one framework for web sites to use. Another is .jsp, Java Server Pages. And, there are others.
It's not a file, per se, that is sent with a submit button, but "form data", which is just a bunch of parms passed back to the server. A "buffer", if you will.
A file would only be sent back if you were prompted to upload a file (and again, ir would not necessarily have an ".asp" extension. A web site serving up a page to a visitor would have an extension of .asp, if and only if they were using the ASP framework.
