Also, you mentioned "replacing" dds files. Is there something we need to back up before installing a mod?
Obviously I'm totally lost!
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Kroym I know how you feel.
After you unpack the ArtO.FPK, you will see a bunch of folders in the Assets folder.
goto the Art folder and open.
now see the folder that says Terrain, open it.
You will then see a folder that says, routes, open it
You will then see another folder that says, roads, open it
Now you can drop the Unzipped mod into this, it will over write the original one (make sure you back up the original roadprimitive.dds file and put it in a safe
place.)
I hope this helps you
Good luck.