Nothing bad will happen - Windows will simply store them in a more efficient and compact fashion - same thing is done in Access. She won't notice any difference[except in the space they take up on her hdd] - all will be able to read as before.
The Evil Within 2 review-in-progress
InVision Studio takes on Adobe XD and Sketch
Camera tips to take better iPhone photos
Comment transformer un iPhone en borne Wi-Fi ?