Open/import .vstpreset files

Hi.

When I reinstall Windows and Cubase, I always backup the vst3 presets folder in the local Documents folder.
But I’ve never been able to make use of these vstpreset files again after. Even though I copy them back to the correct folders, they don’t show up in the list.

I’ve tried an external application called fxtractor to convert them to fxb-files, but it couldn’t convert them…

How do I make this work?