I just read about this program yesterday, http://www.winxdvd.com/specialoffer/oct09.htm. It's a freedownload and supposedly supports RMVB files. I've never tried it so I can't say if it's good or bad, but for freeware it might with worth a try. Other freeware apps are DVD Flick and DVD Styler, although I've never used either with RMVB so I can't say if it's supported. If none of these options work you might try converting the RMVB video to mpeg2 with something like Super of FormatFactory and then use DVDFlick or Styler to create the DVD.