Wine's library path

I just installed Wine (1.8) and Q4Wine (1.1), in order to run a win application.
But every time I execute the application, a message appear saying:

Quote:

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Error while loading application settings. wine's library path for 32 and 64 bit is not set.
Please, go to the q4wine options dialog and set at least one path.

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Where can I set the Wine's library path?
And, where are the libraries for Wine?

Thank you, in advance.