Just for general info DX is still supported by SONAR X1, as is evidenced by the fact that Sonitus fx are still there working away as always.
The issue is that unless the DX fx or intruments are ported to 64 bit they wont work in X1 x64 as there is no BitBridge for DX/DXi like there is for VST/VSTi.
I'm thoroughly confused as to where or what the OP has installed. He says they don't show up in the Plugin manager but talks about their CLSID which is only visible when you highlight a DX/DXi in the centre column of the Plugin Manager.