Thanks, Craig. These DLLs opened up the instruments and FX you listed in 3 of my other DAWs. Studio One isn't one of them.

There obviously are many factors to consider when deciding a long term approach to the ultimate demise of Sonar, but if DX plugins and instruments are important to you and you don't want to depend on questionable third party software, Reaper is one of the few DAWs that supports them natively.

Thanks yet again, Craig. I checked a few in Studio One. Sonitus:Compressor was the only so far not to work (though as a Robotizing FX it might have some use ).

Sonitus didn't turn up in Mixcraft when i started, but now with these dll's in place it seems all but the compressor (distorted) work fine...

Thanks. They will be handy... too bad about the compressor...

I can confirm the wrapper works in Studio One.  However, as with others, the Sonitus Compressor did not work (just a buzzing noise that ends when the limiter button is turned off), and the Gate did not work either.  The rest worked fine.  Not all of the instrument-related ones worked through (one of the Strum ones, and some keyboard ones -- keyboard activity is shown but no movement on the plugin keyboards and their midi lights stay dark; not a major loss considering the other instruments I have).
 
Steve

Woodyoflop
But not the overloud plugins unfortunately nor the BT plugs.

Yeah, they're locked to SONAR, as is Breverb, Adaptive Limiter, ProChannel, and maybe one or two more I'm forgetting.

Hey hey! Thanks Craig.

@ ptheisen.
  When i remove the dx wrappers, the dx plugins disappears from the plugin list, so it seems that  they are needed.

My guess about the compressor and gate not working via the wrapper is that these are the two plugins that have potential side-chaining functionality, and the wrapper does not deal with it gracefully.
 
Interestingly, these same two plugins do NOT appear in Reaper, which does handle all the other DX plugins "natively". I'm now thinking that Reaper is also using the same (or a very similar) wrapper behind the scenes, and adds a little bit of logic to filter out the two plugins that it knows won't work properly.

This thread got me to thinking - the xlutop stuff was associated with a product they used to make called Chainer, the guts of which they eventually gave away. That triggered a memory of other FX chain tools that could host DX(i) plugs and then themselves appear as VST(i) plugs. I never got too far into that, as SONAR supports DX(i) natively and has great routing already, not to mention how they later introduced FX chains of their own. But it could be worth trying other wrappers/routers/racks to see if they work better with rogue DX plugs like Sonitus Compressor & Gate (and/or others).
 
I did some digging and found these, though there may be others:
 
 
vb-audio DxRack
http://vb-audio.pagesperso-orange.fr/us/products/dxrack/dxrack.htm
 
Patchwork (Blue Cat Audio)
https://www.bluecataudio.com/Products/Product_PatchWork/
(do not explicitly say that DX is hosted, but it is listed as one of the contained technology standards) 
 
Console
http://console.jp/en/index.html
 
Not sure of the current state of these... some are a bit long in the tooth, but may still work, at least as well as the xlutop stuff.
 
I still need to get around to obtaining a license of SO and getting up to speed on it. But in the meantime if anyone has the time & energy to try any of these please have at it and let us all know!!
 

Solved
 

By the way, MIDI FX work too. If you copy the mfxshell.x64.dll as well, you can insert Sonar's midi fx. In Studio One the patcher didn't seem to have a midi-out mapping, so the only useful one was Chord Analyzer (which, by the way, I am shocked I only just discovered!!!)

And in FL Studio as well

Where I could get most of the others working too, although the seemed a bit fragile:

cboshuizen
By the way, MIDI FX work too. If you copy the mfxshell.x64.dll as well, you can insert Sonar's midi fx. In Studio One the patcher didn't seem to have a midi-out mapping, so the only useful one was Chord Analyzer (which, by the way, I am shocked I only just discovered!!!)

And in FL Studio as well

Where I could get most of the others working too, although the seemed a bit fragile:

How were you able to get it working FL? I've been trying and can't get any of then to show up

Works like a charm. Thanks Craig!

Anderton
You can use the Sonitus SurroundComp, just don't use all of it...treat it like a two-channel compressor, select L/R,  and it works fine. I wasn't so concerned about the Sonitus Compressor because the Studio One compressor is very similar, with a few improvements. 

 
Thanks Craig - that's great news on both fronts!
 
I have placed my order for SOP and look forward to checking out everything in it, including whatever gems like these that you uncover.