Race Track Builder Xpacks collected 2017-02-01

As I've used some of these assets and some people are struggling, here's a short tutorial for RTB.

When using the RTB (Race Track Builder) you HAVE to do this:
- Extract the Zips you wan't to use from the main zip to "Documents/Race Track Builder XPacker".
- open the XPacker from the launch menu when starting RTB
- Open the zip and press yes in the dialog
- Assign a category to each OBJECT manually and press save each time below
- Top Right -> Zip to RTB
- Use the XPack in your RTB Project :)

What the f???????? Just lost 1 month of work because of this! Anyone knows how to recover the track? I had a backup folder but it doesn't work anymore!

Mate, don't know what you uploaded but it completely broke my saved track and I lost all the progress.

You have to assign categories to each xpack, not just put the BTB to RTB, that we know how to do