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When I select an image and click Open, a window appears showing my picture.

If I right-click on an image and select Open from the context menu, that is what happens. When you click on Browse, it will open up a file requester. When you left-click on a file, its name will show up where it says "File name:" at the bottom. In the bottom right of the requester are two buttons that say Open and Cancel. The Open button is the one to use to select your file. Alternately, you could right-click on the image and choose Select from the context menu, or you could double left-click on the image.