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Yup...! Indeed, no need. Direct from an important tool wiki ( http://niftools.sourceforge.net/wiki/NifSkope ) :

Exporting

* Right-click on the NiTriShape/NiTriStrips block you want to export, and select .OBJ -> Export Mesh.
* Type in the file name. This will write out a .obj and a .mtl file which you can edit with your favorite 3D modeling program.

Here is where you so are exporting from that tool as OBJ. Time to import as OBJ into Wings. Then do your modeling, or refining.

if you want to go the othe direction now, modeled in wings, and want to import into (as usual in games, often is better to export first from and existing/oficial or fan made game mesh, and import, and start from there, so scale, etc, is the actual game one) that tool so to get it later into game, ok, the wiki of that tool also clarifies :

Importing

* Right-click on the NiTriShape/NiTriStrips block you wish to change, and select Mesh -> Import .OBJ.
* Select the right .obj file, and that's it.

So, you just would have needed to export as OBJ from Wings. Then make the above step.

Wings3d has I/O of OBJ, as you see. Only thing to be aware, or most important, Wings is based on winged edge structure, so, no holes in the mesh. If you need holes (you can make carved holes, and anything needed, you cannot make a single face wall, that's it, but have no limits, if use well hole material) you then use "hole material " , that blue one. This way, whatever the faces have that material, will be deleted in export time, making your needed holes.(I am referring to breaks in the mesh, as this is not needed if you just make an extrude towards inside)