Tools for opening Freelancer's 3D models

[Mercury]

Hi everyone!

I'd like some help with what tools to use to edit 3D models of Freelancer such as ships, and solars.
File extensions I need help with:
.3db
.cmp
.sur

Apps for Linux is preferred but any operating system is fine. Back in the day I've used Milkshape 3D but that was 10+ years ago. If by any chance there is an online tool that's also perfect.
Also some explanation on what the above extension files are responsible for would be welcome!

Thank you!