How do I unjoin a large file into separate objects?

How do i unjoin large object by loose parts? Because when I unjoined the objects in the picture below the computer said the application is Not Responding… please help me…

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First ensure you have a clean model by removing any unwanted parts or duplicate vertices (W / remove doubles)

If you computer is not capable of unjoining all the separate parts at once, try selecting only part of the model, separate, select another part of the model, separate, and repeat

i try to separate one part at a time, but the application still hangs. (not responding) im using an i7 laptop @_@

Upload to http://www.pasteall.org/blend/ and give the download link