For opening .MBLook file u will need newer version of Magic bullet looks [ Magic bullet looks 2.0 ]
It can be downloaded here :  
http://www.youtube.com/watch?v=57Qx1evmrRk

Where to put .MBLOOK file?

Local Disk(C:)/Users/ "your name of pc" (mine is tomislav)/AppData
(be sure that u can view hidden folders)/Local/LooksBuilder/Looks/Custom/


After that Open mblooks in vegas and just put your mouse cursor on the left side of the screen and new window 
will slide from the left.Find "Custom" box and click on your desired CC



Have fun.



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