[SFD-discuss] 'What is Open Source' Leaflet

I'm trying to edit Melissa Draper's excellent 'What is Open Source?' leaflet using the Scribus source files provided on the SFD wiki and on the geekosophical site (which appear to be slightly different based on md5sums). In either case, Scribus tells me that the .sla files are not in Scribus format. This is with Scribus 1.2.5 on Ubuntu Feisty. Has anyone had better luck editing these? Obviously Melissa was able to. Does anyone with more Scribus experience have any idea what I might be doing wrong? Thanks Alex Gretlein SFD - Lehigh Valley PA, USA team