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I was trying to look for unused content in LEGO Island, but it seems to be in archives. It doesn't appear to be compressed or encrypted. There are lots of .SI files, but only one WDB file. WDB might stand for World DataBase, not sure what SI stands for.
Download ISLE.SI:http://www.mediafire.com/?4yssv3i6c7xn55g
Download WORLD.WDB:http://www.mediafire.com/download.php?bppdvz7v323aqq9