The fact is that if i delete all this 1,2gb copys and copy the original clips and the proyect file into this new folder instead of the one that the proyect manager saves into it (which has a different size, by the way), i can open the proyect in other machine with no problem. I think that premiere should save references to the subclips taken from the original clip into the proyect file, as he does with transitions or titles, and giving him this original clip from the subclips where taken should be enough to rebuild the proyect. So i think this could be a bug of the 64 bit versions, because i´ve checked that in CS3 this procedure works fine…
Regards
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