ANOTHER NOTE FOR WHEN SPAWNINGthis is an issue i've ran into myself. ALWAYS REMEMBER the difference between the "DPI_" and the "DPE_" at the beginning of certain .nif files in World.img.
the "E" in "DPE" is obviously for Exterior, and the "I" in "DPI" is for Interior.
What this means, is the .nif's beginning with "DPE" can only be spawned in the EXTERIOR, whilst the "DPI"'s can only be spawned in interiors.
also, you can only spawn the
.nif files from world.img, as they are the actual models, and the .nft is simply an archive which holds the textures that are USED to color the .nft(model).
and from what i've tried, spawning pedestrian models this way doesn't work. you still need PedCreatePoint or PedCreateXYZ.
and as for models such as JunkCarA and JumpFun_Test are normal, and the JumpFun_Test is a really cool. spawn it, and you'll find out what it is.