I've been using 2.78, just until 3 is finished. But 3 will be MUCH better, once they get it done. I especially like the integrated crossfader. I'm not sure about your default problem. The only thing you could do is open my computer, Go to Tools --> Folder Options, and click the File Types tab. Find MP3 on the list and make sure its set to open with Winamp 3. Let me know if that helps.
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