Mmh, I don't see immediately what's causing the problem. The idea I have is that I am going to write a step-by-step recipe how to do what you want to do, so that we can find at what point the first thing goes wrong. It could be that I am explaining stuff that's already obvious to you, but I guess, better give more information than too little. So:
(From your previous comment, I am assuming that you are using a Mac? It shouldn't matter much, but would probably good to know anyway.)
- Go to
github.com/OoliteProject/oolite-mesh-converters and click on the green button with the label "Code".
- There will be a small pop-up window. There you click on "Download ZIP". This should download a zip file called "oolite-mesh-converters-master.zip". Save it wherever you can find it (to the desktop maybe) for now, you can remove it later when we are finished.
- Unzip/extract the zip-file (depending on which OS you are using, this may be done by right-clicking on the folder and selected the "unpack here" or "extract here" option).
- Now you have a folder called "oolite-mesh-converters-master". Open a terminal and go into this folder. If you're on MacOS, you can check if you're really there by entering "pwd" into the terminal and then press enter. This should print a file path that ends with "/oolite-mesh-converters-master".
- Check if your python installation works: enter "python2 --version" into the terminal. This should print something like "Python 2.7.x", where "x" can be any number.
- Now copy your dat-file into the same directory (i.e. into ".../oolite-mesh-converters-master"). I am assuming that it is called "hship.dat".
- Now enter "python2 ./Dat2ObjTex.py ./hship.dat". This should produce the mentioned "hship.obj" and "hship.mtl" files.
Let's first get here. If at any part something different happens that what I described, let me know. Maybe I messed up, or we found the problem.
I don't really know what to do about the Wings3D part, as I never used it. Just in case you have a lot of free time, you could try to use Blender.