What happens is that between the time you click and the time the menu is displayed, Explorer needs to figure out which items to put on that context menu. If you right-click on a jpeg file, you might get some things that you wouldn’t see if you clicked on a. That right-click menu is called a context menu because what it contains varies depending on what you click on, or the context.

You may have noticed that programs can add things to that menu that pops up when you right-click on a file in Windows Explorer. Sometimes when you install software, there might even be an option to the effect of “add context menu”, or something like that.

If anything it’s Windows fault for being so accommodating with the various programs that you can install. You know, Windows often gets the blame for this kind of thing but it turns out it’s rarely Windows’ fault.