Did you download the Management Studio with SQL Express? SQL is not like Access, you do not open a Database file directly, you work with it through management tools (Query analyzer, enterprise manager, etc)
hth.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
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Technical Editor for:
Professional Search Engine Optimization with ASP.NET
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Why can't Programmers, program??
http://www.codinghorror.com/blog/archives/000781.html
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