I am not sure exactly when this occurred but just noticed some photos that I copied from my iPhone via usb cable to Win 10 “pictures” folder as early as February or maybe January not only transferred the .jpg but in addition created an exact copy as a .mov. The .mov is about a 1 sec movie of the .jpg image. Really weird!
See attached images. Notice the pic number is the same on both.
Note, on the iPhone only the .jpg shows so the duplication must occur doing the copy to Win 10 (home version).
I know there have been some photo app problems with the Win 10 but could not find this particular situation on Woody.