Yes, I use Stuffit for all my unzipping. I even tried 7zx for the heck of it last night but all it did was make a new zip. UPDATE: I had an idea while responding and was going to drag the .sit directly into Stuffit but to my surprise, the application wasn't in my app folder. I just downloaded a new copy and the .sit opened immediately. This is starting to creep me out. I wonder what else is disappearing on my computer? ANYWAY, thank you for all the work on my gremlin problem.