KB: Run mixed-signal simulation off of netlist generated externally to compare the results from other engines directly
Altium Designer
Mixed-signal simulation netlist generated externally (save as a text file with *.nsx file extension) can be opened in Altium as a standalone document to run simulation off of it directly to compare/verify the output of Altium simulation engine and to rule out possible issues with schematic capture and model linking in Altium.
Solution Details
Mixed-signal simulation netlist generated externally (saved as a text file with *.nsx file extension) can be opened in Altium as a standalone document to run simulation off of it directly.
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Open the .nsx file as a free document in Altium, or create a project that contains just the .nsx document
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Run simulation from menu command Simulate » Run Simulation (or just press F9).
Also, you can open a generated netlist in any project (shown in the project tree of Project panel "Generated->AdvancedSim Netlists"), modify it manually on the fly and run.
However, if you run simulation from Simulation Dashboard panel thereafter, it will rewrite the netlist and your manual modifications will be overwritten and lost. Also, in such case, it does not always refresh the text in the netlist document window opened (but it is updated in the document in actuality), so that you have to be mindful and avoid the situation where the netlist you see and the one you simulate can be different.