Sylviavioletbaby What do you mean that it doesn't show the Sims 3 logo? If you're talking about the file type, the important thing is not any logo but what extension it has. As I said before, a file that ends in .package is treated like a mod, and a file that ends in .Sims3Pack would be installed through the launcher, which you can't do right now.
If you don't know what kind of file something is, and somehow Finder isn't showing it, you can right-click the file and select Get Info. You can see the file type, as in the extension, under Name & Extension.
If you need to use a different browser for some reason, try Firefox.