Did you install the right version? 64-bit if you have 64-bit Windows?
Also there is a workaround mentioned in one of the comments on the home page of RW thumbnails.
No option showed up in the Control Panel.
Using Win10, I tried to install RW Thumbnails, and well, it did install, but I can't find anything for it in the Control Panel. Any idea what's up?
I've seen people asking about this problem on Win8 too.
Did you install the right version? 64-bit if you have 64-bit Windows?
Also there is a workaround mentioned in one of the comments on the home page of RW thumbnails.
Yeah, I got the 64bit version, that's the right one.
I didn't see the workaround until you pointed it out, but if you're referring to the thing where he renamed RWThumbnailsProxy to a CPL file, that doesn't run for some reason.