Can someone tell me how to close a pdf file in Windows 8.1? (I assume Windows 8 has the same problem.) The pdf has a black background. If you right-hand click, some options appear, but there is no option anywhere for closing the file. All that I've found to do is run your finger down from the top of the touch screen, which I believe is supposed to close any file (the file goes to the bottom of the screen, and closes when it flips over). But this will work with a multipage pdf only after 5 or 6 tries, which after so many pdfs should eventually wear a trough or leave a permanent grease stain down the middle of the touch screen. Any info appreciated.