This is what you are asking for:
Also read on FSO
But yes, if you can't use FSO if ActiveX is disabled on client system.
It can get a list from the server and display that to the client on the browser, but, to get a directory structure from the client computer to the browser would require some other application reading the directory structure and sending it to the server, and the server sending it to the browser.
Now, if you are using Actionscript it is possible to read the hard drive, and I expect that Silverlight would allow you to do this also, but I don't know.
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