How to open and read an external file in Dashboard widget?

I am new to Dashboard widgets and also Javascript. I have written a widget that needs to open and read a file on the local file system. I have searched a lot and have not found any documentation or reference on the internet as to how to do this.
I know it can be done since there is a checkbox in the widget attributes that says "Allow External File Access".
can anyone help me out here?
Thanks

You need to define the AllowFileAccessOutsideOfWidget key to Yes.
You also need to define the AllowFullAccess key.
You may also need to define the AllowSystem key (to Yes of course).
Mihalis.
PS. If you cannot find any other documentation please check http://widgetbook.blogspot.com.

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