What are they & what's the difference between them and Preset files?

Or the difference between a DSF and a Scene file?

And what is a "Tri-Ax Weight Mapped Figure" and what does that do in creating a DSF Character file?

I know what Tri-X film was way back in the day, but never heard of Tri-Ax. What is their purpose? 

DSF is a new file format which allows weight-mapping info, multiple UVsets, etc. in DAZ Studio 4.  It can be used to save scenes or presets which include weight-mapped items, but can't be read in Daz Studio 3 -- if you want a preset to work in DS3 also, you need to save as .dsa

Tri-Ax is the weight-mapping system DAZ 3D developed -- it's called Tri-Ax because the weight-map data uses 3 axes, as opposed to 1 axis in most weight-mapping systems.

What would be an example of a weight-mapped object? 

What are they & what's the difference between them and Preset files?

one is the actual item ie..genesis or clothes, ect.. the other is just that a preset for applying a shader or saved dial pose or character

Or the difference between a DSF and a Scene file?

a dsf file is the actual item ie, clothes and can be redistributed..

the scene file is just for your own use so you can reload the work you all ready did.

And what is a "Tri-Ax Weight Mapped Figure" and what does that do in creating a DSF Character file?

that is the genesis figure and its items, no other figure has it..

as stated above that is what daz created for weight mapping ect..

What would be an example of a weight-mapped object!

that would be genesis itself and all its items...ie clothes

OK, thanks! Been wondering about that for a while.

Or any other figure that you weight-map, e.g. if you wanted to WM V4 or M4.