[King's Hunty]

With this tool you can convert them: http://3doc.i3dconverter.com/formats.html

Here's the zombie exported to Blender: https://imgur.com/a/0Vt2D37

However, note that the imported bone structure is incorrect here. Only the rotations and positions are imported as plain objects without hierarchy. I don't if I did something wrong in the 3D converter tool where the structure seems to be correct: https://imgur.com/a/jwz8sXl
The developer can provide some answer when asked. Also note that the trial version deletes every fifth face of the converted model so you may need to purchase the full version.