When burning with "Ulead VideoStudio" or "PCTV" or "VCDEasy" VCD's dont play on my MUSTEK 560! If I burn with "EasyCDCreator", it plays OK! All VCD's play ok in a JOCEL player

I noticed the file structure is different:
- BAD VCD contains directories \MPEGAV, \SEGMENT and \VCD.
- GOOD VCD contains directories \CDDA, \CDI, \KARAOKE, \MPEGAV, \SEGMENT and \VCD.

In both cases, they contain the files ENTRIES.VCD, INFO.VCD, LOT.VCD, PSD.VCD and the MPEG file MUSIC01.DAT.

Can anyone tell me why this happens? Thanks in advance