The DVD standard requires that the video on a DVD is in the MPEG2 format. So, if you give DVD Architect an AVI, it has to render that AVI into an MPEG2.

DVD Architect cannot work with a VEG file -- a VEG is not a video file; it's a data file that tells Vegas what clips, FX, etc to use in order to create a video file.

If you want to save a step, then render your VEG, in Vegas, to an MPEG2 file. Though there has been some debate whether or not this is actually faster than rendering to an AVI and then having Vegas render that AVI to an MPEG2.

My workflow for such a task happens to be:

1. Create my project in Vegas.
2. Render to an AVI
3. Start a new project and bring just that AVI onto the timeline
4. File -> Render As -> MPEG2 (filetype) - DVD Architect video stream (template)
5. When that's done, File -> Render As -> Dolby Digital AC3 (filetype) default (template)

This produces one file that only has the video and one file that ony has the audio, which results in the least work for DVD Architect. It can work with a single file, but that just takes longer.

You can skip the AVI section if a DVD-compliant MPEG2 is your final and only destination, but I usually like to have the AVI around so I can make other formats (especially web-ready ones) from it without making Vegas render all the cuts / effects.

Hope this helps. If not, ask away and someone who writers better than I will probably answer for you. ;)

Rob