This is so cool!
If it doesn’t work for you (wait a few seconds first, it takes a while), you probably is having the same problem I had, where your old blank thumbnails are saved and not being updated. Use a system cleaner like CCleaner to make your system forget the old ones and be able to generate new icons.
How did I miss this!? Going to check it right now~
Hehehe~ I got mine to work Bruno 
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Thank you for this software/tool spotlight @BrunoSupremo!
I’m sure modellers, animators and modders will find this most useful.
So cool and really helpfull! Thanks Bruno 
Do you have Qubicle? I’m suspecting that I need to have it for its thumbnails to work.
I’m afraid I don’t have Qubicle installed.
Still thinking if I’m gonna save up for it…
I just have MagicaVoxel, VoxelShop and StoneVox installed on my laptop 
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Oh, I got it to work! Had to use those system cleaners (in my case CCleaner, recommended) to clear/erase my old thumbnails. Now it is working fine!
awesome! thanks for the link : )
