Hi,
With isolated storage, data is always isolated by the user in a virtual file system that can be just one file in the root directory or a tree of directories and files.
The isolated storage data compartment is an abstraction, not a specific storage location. It consists of one or more isolated storage files, called stores, which contain the actual directory locations where data is stored. Any kind of data can be saved in
the store.
http://msdn.microsoft.com/en-us/library/cc221360(v=vs.95).aspx
Besides, this is thread could help you:
http://stackoverflow.com/questions/20913550/change-silverlight-isolated-storage-identity
Best Regards,
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