KSVCD Result question

I converted a program stream of a DVD to KSVCD, by only opening the .VOB, choosing the preset, choosing de-interlace, and pressing Go. The result was spanned over two discs, but this is what I don't get; there's three .img files for each disc. There's the 1, 2, and then there a pre-gap. I read on the guide for DivX to SVCD, that you burn 1 and 2... what's with this pregap.img file? Also, there's a .toc file but I can't choose it in Toast (Multitrack CDROM XA). Here's a more detailed list of files...

movie-1.mpg
movie-1.mpg_01.img
movie-1.mpg_02_pregap.img
movie-1.mpg_02.img
movie-1.mpg.toc
movie-2.mpg
movie-2.mpg_01.img
movie-2.mpg_02_pregap.img
movie-2.mpg_02.img
movie-2.mpg.toc
movie.mpa
movie.mpv

Thanks!

[major]

what's with this pregap.img file? Also, there's a .toc file but I can't choose it in Toast

They are not needed with Toast, and are meant for burning with cdrdrao-based burners.