Essaie d'aller voir dans le menu Organiser-->Options des dossiers-->Onglet "Affichage". Vérifie que la case "Toujours afficher des icônes, jamais des miniatures" est bien décochée.
I had a problem with SolidWorks wherein there were no file previews displayed in the File -> Open dialog.
No preview shown
At some point I must have enabled an option that caused this behavior (I can’t tell you why or when though). Even though the issue was seen in SolidWorks, the setting is actually a Windows File Explorer option. So let’s have a look at the option and one other in the same area. Here’s how to get to the option. In File Explorer, click on the Tools menu. If the menu is not showing in File Explorer press the “Alt” key. There’s actually an option for showing the menu in the same area that we’re heading to. In the Tools menu, click Folder Options. To show previews in the dialog make sure that the option titled, “Always show icons, never thumbnails” is disabled.
Get to File options
Options dialog
Now file previews will show!
Preview showing
When previews are showing, you can also show a small icon superimposed on the image that shows you what type of file it is. That option is in the same location and is titled “Display File Icon on Thumbnails”. Enable it to see the icon.
Preview showing with Icon
By the way, the menu option I mentioned earlier is in the same location and it’s titled “Always Show Menus”. Enable it to see the menus.