Unfortunately I haven't made a SD DVD for years and my last one, which plays okay with VLC, was made with an earlier version of DVDA Studio. Consequently I'm unable to check any made with DVDA7 as I don't have any DVDs only Blu-ray. .
Yes, the .IFO files are associated with VLC. I can play the DVDs from the folder created on my computer in DVD-Lab Pro and on the other computer in Adobe Encore but not the ones created in DVDA Build 100 and the one for January when I started using DVDA. I like the interface of DVDA more than the DVD-Lab Pro but it needs to work.
January would probably have been DVDA build 84. DVDlab was (and is=) a pretty powerful Authoring package but I stopped using it many years ago when they didn't incorporate blu-ray authoring. Unfortunately very little work is being done by anyone these days on further development of disc authoring software. Not sure where to start since everything is working as expected here on VLC 3.0.6 but will play around a bit more later this weekend.
DVD with the menu I start by right-clicking on the parent folder. This works without problems.
@matthias-krutz Strangely (in retrospect) I never thought to try it this way but yup, right clicking the parent folder and then selecting "Play With VLC Media Player" works with all the DVD folders currently on my hard drive. I think Staszek's issue with chapters was that starting the files from the hard drive didn't recognise the chapters.
Do you know if there is Vegas support I can ask why the DVDA does not work?