[Spambayes] how to change the prefix "spam," in the subject ?

[Support]

In the windows version of spambayes, which configuration file do I have to check to change the prefix of the spam message's subject.
According to the default settings and config, the subject line is prefix with "spam,". I want to change it to something like "{***SPAM***}.
Is it possible to do so? 

Thanks.
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