How yo put already made anims onto a new weapon? Thread

I've made a knife which I want to use for a mod I'm working on. I just need to know how to use a set of already made animations (from another knife I've decompiled.) for my own knife? Ive made the knife alone, no arms or hands or bones or whatever. Just a textured knife.

If needs be, redirect me to any place to check for help.
Please be as detailed as possible as im new to moddling.
Thank you

EDIT: Im using Milkshape 3d for Half Life 1 engine but it's okay, i figured out how to use animations for my models.
Thanks anyway

Edited by: poorboy22

(listing which engine you are using and what 3d program might help narrow the results)