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(and the corresponding index file, pages-articles-multistream-index.txt.bz2) pages-articles.xml.bz2 and pages-articles-multistream.xml.bz2 both contain the same xml contents. So if you unpack either, you get the same data. But with multistream, it is possible to get an article from the archive without unpacking the whole thing.
Altium Designer was originally launched in 2005 by Altium, then named Protel Systems Pty Ltd. It has roots in 1985, when the company launched the DOS-based PCB design tool named Protel PCB (which later emerged into Autotrax and Easytrax).