it looks like no circle but some spline,
look at replay:
and if this is the case I am talking about and you dont see CIRCLE - everything is alright and dont even think about G02/03
In the operation dialog of the tool path you are post-processing, double check that Motion Output Type in the Machine Control group is set to Arc - Perp to Tool Axis.
as juraj said, if there are no CIRCLE moves in the internal toolpath (I use: Right-click on operation -> toolpath -> list) then you will never get arc output.
Note if you are doing this for high speed machining, you probably WANT G1 output (although I am no expert, I have heard that the HSM algorithms have to "stop" at arc moves, then restart again after the arc, which will slow down processing/machining)
Production: NX10.0.3.5 MP5 + patch/TC11.2
I'd rather be e-steemed than e-diseaseled