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Have you tried the MapCAD tools? There is one called "Segmenting" that will split a line into equal or defined steps. In the 32-bit version it was called "Add Nodes".?
Or there is the Distance Marker mbx that will place points at set distances along a polyline.
what are you trying to do?
I know of a few tools that can insert points along a line for every x meters. I'm not sure I know of a specific tool that will add nodes to the polyline for every x meters - besides the one John mentioned above.
But maybe there's another way of doing what you want to do.