Opening a file from Version 2.83 in Version 2.49

I am attempting to make a mod for the game Fallout New Vegas… To do that, I need to make a model in Blender, then export it as a .NIF file, but this only seems to work in version 2.49, but I have no idea how to use that version, only version 2.83… When I make something in 2.83 and attempt to open it in 2.49 so I can export it as a .NIF, I simply end up with a blank screen… Is it possible to open a file made in 2.83 in 2.49?
So far I’ve managed to export a file as a .OBJ and successfully open it in the older version, but it would be far easier if I could just open the .blend file itself, that way I wouldn’t need to learn how to add textures and materials in the older version since in my texting, I cannot transfer textures or UVs and such if I use my current solution of transferring .OBJs