The album "100th Window" by Massive Attack with the track "Butterfly Caught" was released in 2003, along with "Meteora". The remix wasn't officially released. This is work on the request from a famous band (like Depeche Mode)! I think as the shortened instrumental Mike could added it to the release.
I think it's shortened demo from "Linkin Park Underground 9: Demos" with Mike's rapping, but with alternate lyrics (fragment on "The Making Of Meteora" from 04:27).