WC Download on a Mac
Macs don't have extensions, they know that a specific file needs to be opned with a specific application with a tiny instruction line they add to the file itself. Therefore, files created on a PC often aren't recognised by Macs they have no clue what the file is, they just consider it a "PC" file (showing it as a PC icon). So you may need to open the application first, then get the file with File/Open. If youo have Internet Explorer on your Mac, try to do that (File/Open) to open the wallpaper JPG, then from the context menu I think there is an option to set as background. Or if you have some gfx editor, try to open and resave it.
They are when they work, but just like PCs, once you need to get stuck into the detail, it can all get very complicated for people not used to this stuff.

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