By definition web page, that displayed in a browser, can not access the OS - including the file system, and that's for security reasons (imagine MS was putting files on your computer while you are browsing for some answer in MSDN).
However HTML5 includes a File API, that can help you, but be aware - it's only implemented by some and partially...
You may start here:
https://developer.mozilla.org/en-US/docs/Web/API/File[
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