Hi Cyril, I downloaded it and tried it on Win7 Pro 64bit (running in Virtualbox), and was able to open as expected. However, looking in the zip file itself, I noticed about two dozen "*_Zone.Identifier" files that I was not expecting to see. They likely should not be there; they have something to do with IT security inspections on downloaded files, and I delete them as a matter of course whenever I see them (as part of a download). I'm not sure why the Pharo build process would have these. I tried launching Pharo from this zip file before and after I removed these files... It worked in both cases; no corruption reported. However, since your error dialog was reporting one of these 'zone' files, I would trying removing them and see if that helps. -Ted -- Sent from: http://forum.world.st/Pharo-Smalltalk-Developers-f1294837.html