The game will automatically pick the right pic from the three resolutions depending on the screen resolution you use. Fullscreen or windowed mode does not matter here.
So if your screen width is below 1280, it will take the _1024 pic, below 1920 it will take the _1280 pic and above 1280 it will take the _1920 pic.
So in your case your resolution seems to be between 1280 and 1920 but you only had a _1024 file, so it came up with the default pic.
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