flt to obj conversion is typically used for the purpose of exporting 3D models between two different formats, from MultiGen Open Flight data files (.flt) to 3D object graphics (.obj). Blender is most likely the best choice for this, since it supports plethora or formats and you can download and use it for free. You can also find numerous guides and tutorias for it all over the Internet.
Updated: May 25, 2023