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Would you please let me know what problem you've encountered? It's very difficult to provide you with any suggestion with this limited info. Would you please provide more information about your issue?
In my Windows 7 system, the directory locates in "C:\Users\<user name>\AppData\Local\Microsoft\Microsoft SQL Server Data\SQLEXPRESS", you can check if this is the folder you are looking for.
Waiting to hear from you.
When do you get the error ?
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