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by shravan 4282 days ago
Nop, it's a reference to Photoshop's Large Document Format. [1]

[1]: http://helpx.adobe.com/photoshop/using/file-formats.html#lar...

1 comments

Cool. It's been a while since I've used Photoshop on a regular basis, so I'm out of the loop. It just seemed odd given that psd is used directly underneath the icon.
Since I've know about it, I've liked the extension because in .PSB, the B is for big.