In Windows 10, when you are using the thumbnail preview feature in File Explorer, there is a drop shadow around the thumbnail. You can get rid of it or customize it with a simple Registry tweak. Let's see how it can be done.
To disable thumbnail preview border shadow in Windows 10, do the following.
- Open Registry Editor (see how).
- Navigate to the following Registry key:
Tip: You can access the desired Registry key with one click.
- On the right, modify the new 32-bit DWORD value named "Treatment". If you do not have this value, then just create it. Note: Even if you are running a 64-bit Windows 10 version, you need to use a 32-bit DWORD value type.
- To disable thumbnail preview border shadow, set the Treatment value data to 0.
- Restart Explorer.
Here is an example of shadowless thumbnails. Before:
You can also set 'Treatment' to 3. In that case, thumbnails will have a video reel border. Here is how it looks:
A value data of 2 represents the default appearance with a small shadow. To reset the thumbnail preview appearance, you need to set the 'Treatment' value data to 2 or just delete it.
Here are ready-to-use Registry files which you can use to play with thumbnails:
The Registry files include a tweak to disable the shadow, a tweak to enable the video reel and an undo tweak to restore defaults.