How to open a local disk file with JavaScript?

Question

I tried to open file with

window.open(\"file:///D:/Hello.txt\");

The browser does not allow opening a local file this way, probably for sec

Answer 1

The HTML5 fileReader facility does allow you to process local files, but these MUST be selected by the user, you cannot go rooting about the users disk looking for files.

I currently use this with development versions of Chrome (6.x). I don't know what other browsers support it.