I'm trying to get used to Mac because I want to write some novels with Scrivener, but I'm mainly a Linux guy. I made a .7za passworded archive and threw it on Dropbox, but now I can't for the life of me extract it on a MacBook running Leopard. I've tried 7zX and Keka, but both of them are determined to create either a .7z or .zip archive rather than extract the .7za. What am I not getting here? I tried to get 7zip, but all the links I find to a Mac version are broken.