Starting with IE for XP SP2, web pages generated locally (e.g. in a temp directory) do not load properly in Internet Explorer if they include Active Content. This is a result of improved security surrounding the Local Machine Zone. Depending on your operating environment, it may not be possible or desirable to change IE’s security settings; moreover, such changes would have to be applied to all machines accessing local content. The “Mark of the Web” is a better solution.
Microsoft has implemented a new feature called the “Mark of the Web” (or MOTW for short). It is a specially-formated HTML comment that directs IE to open the page in the same security zone as the specified URL. Two valuable examples are:
<!-- saved from url=(0014)about:internet -->
<!-- saved from url=(0016)http://localhost -->
Under default security settings, IE is forced to open the page with the former code in the Internet Zone and a page with the latter code in the Local Intranet Zone. The number in parentheses is the number of characters in the URL.