ive been digging a little thru VCs files but cant quite figure out how thier maps work. open to ideas if anyone has any.
I believe you can use GTASAULTIMATEEDITOR to open and load any level model from all of the 3D era games. If not you can try to use 3DRipperDX to extract the models and textures. But that gives you a very botched,ugly, and incomplete, model. You can however do it over and over again to eventually get the entire level.
You can try this or my ultra-tedious recommendation of tools,
MEd for opening a 3D preview of the map and also check for the filename to find an exact object via
Spark, an .img file viewer that has preview of .txd (texture format, for those who don't know) files, also Zmodeller for opening .dff files.
But again, that's up to whoever is feeling like it. :T