How do i burn the .ifo .buf and .vob files in nero

[Mythwind]

When i riped the DVD onto my harddrive i got the three file types of .ifo .vob and .buf. I'm guessing the .buf is audio .ifo has to do with placment and .vob is the video file. When i open nero 5 to burn the dvd it has a Video_TS and Audio_TS folder. I really don't know what goes in where. Have allready made a coaster or 2 and still don't know what i did wrong. there are 3 files that seem to have to go into the video_TS folder and they were the video_TS.buf Video_TS.ifo and Wideo_TS.vob but the reat i don't know.

[bosscain]

everything goes in video ts folder audio ts stays blank,make sure sure your files are able to fit on the disc(under 4.3 G) and use a good ripper like smart ripper