i learned IT and i use to patch games and even create my own missions and levels some time. i have a long history in messing and extracting files. (i am going next year to learn game developing at the university).i even work in 3d modeling.
You know what, are right. Let's man up and open XDR/CDR files to see the model hidden inside.
We're not going to make any significant discoveries until we have the tools to open every file. There are a ton of XDR's and they're super interesting. They hold 3d models inside, and we need a way to view them.
I'm confident that if we all put in the effort together, we will get this done.
This is my plan:
1. As I posted earlier, .XDR in GTA V XBOX = .WDR in GTA IV PC. These files should be very similar. We already have the specs for WDR (see my first post in this thread).
2. There are tools available that view .WDR files since GTA IV was researched to death by awesome people. One example for such a tool: http://shadow-link.nl/?page_id=159
(there are more, google..)
3. We will try to "downgrade" GTA V XDR files into GTA IV WDR files. They both basically just contain a few textures and a list of vertices. Let's throw the textures out for now, and focus on translating the list of vertices from the new format to the old.
4. Once we know how to convert XDR/CDR->WDR, we will use the old WDR viewers to examine them.
We have to divide up into teams that focus on different tasks. Let's create a team dedicated for this one. I want to be on this team of course, who wants to join in?
For a first step, if you want to help, get us a few WDR files from GTA IV. We need them for research and unfortunately I don't have GTA IV on my computer.