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.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.