For reasons that are still not yet known to me, the default Indianapolis doesn't unpack nicely to allow Sandbox to look at it.
The unpack took in WinMip unpacks it and even after fiddling, it still doesn't open.
Unpack the shared.dat and copy+paste the contents of the unpacked shared.dat into the folder you're working in. Don't overwrite anything.
I have a feeling that in order to get this track to feel authentic and worth using, it might be a lot more work than you're expecting it to be. A simple re-skin won't really look accurate, because there's a lot that's changed.
Augh. Why can't I get my X-sections to remain at 12° ? I have a wobble and no matter what, they revert to 3.9°.
I've tried locking and unlocking the geometry, deleting and inserting new X-sections but alas, to no avail.
Oh howl, howl, howl. Cry 'havoc!' and let slip the dogs of war.