为什么我在Dreamweaver中运行ASP文件会提示保存文件?

为什么我在Dreamweaver中运行ASP文件会提示保存文件? 网址栏里的地址不是HTTP而是以file：///开头
只有个别几个系统这样，比如这个页面就会提示
<%
dim u
u = Request.querystring("url")
if u = "" then
u = "about:blank"
end if
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML
xmlns="http://www.w3.org/1999/xhtml"><HEAD><TITLE>图书管理系统</TITLE>
<META http-equiv=content-type content="text/html; charset=gb2312"><LINK
href="images/style.css" type=text/css rel=stylesheet>
<SCRIPT LANGUAGE="JavaScript">
<!--
function InitSync(){
if( "object" == typeof( top.deeptree ) && "unknown" == typeof( top.deeptree.Sync ) ){
top.deeptree.Sync();
}
}
//-->
</SCRIPT>
<!--#include file="conn.asp"-->
<STYLE>
.main_left {
TABLE-LAYOUT: auto; BACKGROUND: url(skins/images/left_bg.gif)
}
.main_left_top {
BACKGROUND: url(skins/images/left_menu_bg.gif); PADDING-TOP: 5px
}
.main_left_title {
PADDING-LEFT: 15px; FONT-WEIGHT: bold; FONT-SIZE: 14px; COLOR: #fff; TEXT-ALIGN: left
}
.left_iframe {
BACKGROUND: none transparent scroll repeat 0% 0%; VISIBILITY: inherit; WIDTH: 180px; HEIGHT: 92%
}
.main_iframe {
Z-INDEX: 1; VISIBILITY: inherit; WIDTH: 100%; HEIGHT: 92%
}
TABLE {
FONT-SIZE: 12px; FONT-FAMILY: tahoma, 宋体, fantasy
}
TD {
FONT-SIZE: 12px; FONT-FAMILY: tahoma, 宋体, fantasy
}
.STYLE1 {color: #FFFFFF}
</STYLE>

<SCRIPT language=javaScript src="images/admin.js"
type=text/javascript></SCRIPT>

<SCRIPT>
var status = 1;
var Menus = new DvMenuCls;
document.onclick=Menus.Clear;
function switchSysBar(){
if (1 == window.status){
window.status = 0;
switchPoint.innerHTML = '<img src="skins/images/left.gif">';
document.all("frmTitle").style.display="none"
}
else{
window.status = 1;
switchPoint.innerHTML = '<img src="skins/images/right.gif">';
document.all("frmTitle").style.display=""
}
}
</SCRIPT>

<META content="MSHTML 6.00.3790.4186" name=GENERATOR></HEAD>
<BODY style="MARGIN: 0px"><!--导航部分-->
<DIV class=top_table>
<DIV class=top_table_leftbg>
<DIV class=system_logo><IMG src="images/logo_up.gif"></DIV>
<DIV class=menu>
<UL>
</UL></DIV
><DIV style="BACKGROUND: #337abb; HEIGHT: 24px">              
<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#c4d8ed
border=0>
<TBODY>
<TR height=32>
<TD vAlign=top width=10
background=images/bg2.gif><IMG alt=""
src="images/teble_top_left.gif"></TD>
<TD width=28 background=images/bg2.gif><IMG alt=""
src="images/arrow.gif" align=absMiddle></TD>
<TD background=images/bg2.gif> 当前时间：<script language="JavaScript" type="text/javascript" src="common/Date.js"></script></TD>
<TD vAlign=top align=right width=28
background=images/bg2.gif><IMG alt=""
src="images/teble_top_right.gif"></TD>
<TD align=right width=16 bgColor=#337abb></TD>
</TR>
</TBODY>
</TABLE>
</DIV>