Is Silverlight able to change a file on a local user's computer?

Question

I considering writing an application in C#/.NET that will programmatically alter an XML file on a user's computer and I trying to determine if Silverlight (and which versions, in what modes) will work for this task.

Here's the workflow:

• User selects file
• Application modifies file
• Application saves file, overwriting original file

Is this possible in Silverlight? If so, in which versions and under what conditions?

Answer 1

The silverlight runtime operates inside of a security 'sandbox'.

You can access files from the computers hard drive only via the Open file dialog. You can read and write from Isolated Storage using Silverlight 2 and up.

Coming in Silverlight 4 you will have the ability to access files from "special directories" such as My Documents, My Music, My Pictures etc. (http://weblogs.asp.net/nmarun/archive/2009/11/27/local-file-access-silverlight-4.aspx)