I am working on an application that uses a lot of information. The application interface will be the same all the time for all users similar to Microsoft Excel. However, the information will be different from user to user. Also the user would want to save different versions of the data as different files. I want to know how to enable my application to save information to it is own file type that cannot be opened by other applications such as text editors. I am using Visual Studio 2005 (C#).
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