They are certainly not the names of the DLLs on my Windows machines. I will assume you have shipped the correct files, i.e. QtCore4.dll, qsqlite4.dll etc.
If data.db3 is your database and it has been installed under the user's Program Files folder with the app it will not generally be writeable on Windows Vista, 7, or 8.
If you are assuming that data.db3 is in the current working directory of the application then it may fail in other environments.
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