VOB e BUP inverted?

[LukeITA]

Hello!
I've a strange problem: I'm burning my DVD with Nero (or ImgTool Burn). A friend told me my DVDs don't work on his player; after some investigations he suggested me that I've a problem with the correct burning sequence of my files...
If I run DVDDecrypter with a DVD burned by me I can read this sequence:
- VIDEO_TS.IFO
- VIDEO_TS.VOB
- VIDEO_TS.BUP
and so on (VOB files always before BUP) while if I use DVDDecripter on the same DVD burned by my friend I can see BUP files before VOB ones.
We're using the same, latest, ver of Nero; the only difference is in the burner (I've got a LiteON 411s and he's got a Pioneer burner).
What can cause my problem?
thanks!

[Joergen]

That's too far fetched imo. What's his player and what media did you try it with?

[Dimmer]

Nero arranges the files automatically provided you created a DVD-Video project. Most likely, it's either the quality of the media that's causing the problem, or incompatibility of the media and the player. I suggest trying a different kind of DVDR(W).

[LukeITA]

hello
thanks for your reply: I'm using Ritek G04 Purple; the strange is that on the same XboX (for example) if I use the original DVDPlayer my disk work, if I use DVD-X (an opensource player) it doesn't. On PC side PowerDVD seems not to like disks with that sequence of file...
Thanks