Send XML request file to ASP page

This is the first time I’m doing this, so bare with me (hope I don’t sound stupid):

I need to transmit an XML request to an ASP page for that page to kick back an XML answer. The file (REQLTR.XML) needs to be submitted to and should return back a ANSWER.XML file.

After asking the company which is receiving the XML file about how to do this, their response was:

We use VB5 to post XML via: Inet1.Execute "" & “”, “POST”, sXML & ""

I don’t have VB5 and nor do I understand the above. Is there another way of doing this something? I am lost.

ps - I tried one method without success: I created a form with an upload input…and just did this:

<form action="" method="post" name="TRNXML" enctype="multipart/form-data">
File name: <input name="ourxml" type="file">
<input type="submit">

This did not work as the company responded saying that they got the following:

[FONT=Courier New]**[COLOR=#ff0000]Invalid at the top level of the document.

Content-Disposition: form-data; name=“ourxml”; filename=“C:\Documents and Settings\IT\Desktop\REQLTR.xml”
Content-Type: text/xml[/FONT]