61D doesn't show on the IFR the chart, however it is a charted airport. That's worth noting, because you can file a flight plan to it without getting into coordinates or radial/distance. Just because it's a "VFR Only" airport doesn't mean that you can't operate IFR to/from the field. The only time that you really need to file coordinates is when you want to go somewhere that isn't in the national airspace computer system. (Private fields or uncharted locations, such as a lake if you're flying a floatplane)
File from your origin via whatever routing (direct, airways, vectors, PFM... your choice) to an intersection, airport or navaid nearby, then direct to your destination. In this case, I would file:
Origin...whatever is necessary to get to V170...V170...OSEGO..61D. File an airport with an instrument approach as the alternate. (The reason that you file the alternate is for lost comm procedures if you are actual IMC when you arrive at 61D and can't land visually or cancel IFR)
Alternatively if the weather is crummy (say 1500' Ceilings), you can file a flight plan to a nearby airport that has an instrument approach (AZO or 35D). Assuming that the vis/ceiling is high enough for you to safely make it from those airports to 61D after shooting the approach, you can descend through the layer via the instrument approach and then get flight following to your destination, or simply cancel.