I was glad that in the announement of Davinci Resolve 15 support AVI Grassvalley HQX files has been added. This is an important step in my workflow for editing captured super8 films.
DR 17.1.1 Studio, 2012 Mac Pro 5.1, 10.14.6, 2x3.33GHz 6 core Intel, 96 GB ram RX 580 8GB graphics card. USB3 card, BM SDI 4K card, SSD boot disk, 3x4TB SSDs in raid 0, 12TB HDD backup. Take your edits to the next level. From streamlined offloading and advanced editing to adding effects and sharing, this exporter app is packed with the tools you need to transform content captured on your GoPro Fusion camera (discontinued)¹ into pro. In November 2017, GoPro launched the Fusion camera, an omnidirectional camera which is capable of recording 360-degree footage. The Fusion was the first GoPro to feature an increased maximum resolution of 5.8K. In October 2019, GoPro updated this line-up with the introduction of the GoPro MAX.
I try to use this feature, but run into problems.
The AVI files with Grassvallay HQX codec I have generated using Virtualdub 1.10.4 can not be imported in Davinci Resolve 15.

Gopro Fusion Studio 1.1
I have tried many different settings in virtualdub, but can not get a file exported which works.
Attached a small video file generated with virtualdub, which I can not import into Davinci Resolve 15.

Gopro Fusion Studio Download


Along with that, what formats & codec(s) are most commonly used in the industry for deliverables (such that I'd be safe saving my original work that way knowing I can reduce the quality for online if need be, but still crank out a high-quality version if and when I need one)?