Check C:\Program Files\BobsTrackBuilder\Temporary Files folder (or something like that).
There will be some randomly named files such as gfgrwgs.ter, iogpcmoa.vdf and other random stuff.
Order the files by date, find the newest one and rename it venue.bin (you have to do this quickly, because after a while BTB will automatically delete these files)
Go to C:\Program Files\BobsTrackBuilder\My Projects (or something like that) and create a new folder called Monaco 1967 or whatever you want your track to be called.
Inside it, drop in the venue.bin file from your temporary files folder. Then create a folder called Xpacks.
Go to C:\Program Files\BobsTrackBuilder\Xpacks (or something like that) and there will be a list of ZIPs that are the xpacks.
Find the xpacks you were using, copy them and paste them into the new xpacks folder you created
(C:\Program Files\BobsTrackBuilder\My Projects\Xpacks (or something like that))
You should then be able to load your track into BTB.
I hope this works! I love the old Formula 1 tracks and can't wait for you to release this.
FerrariMan96