I want to realize following function, when user visited a html page,IE will pop a window,and alert a file will be download,downloaded file type is ".txt",such as "a.txt",the content of ".txt" is automatically created.How to realize this function?

You'll probably need server side code for this. Here's one link which may help if you're using ASP.
http://support.microsoft.com/default...;EN-US;q260519

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Joe