Thank you for usefull infomation.
I try this.

I extract TF2 models and animations with Crowbar.
And, I tried import .smd files.
But, about half the animation is broken.
Like this https://gyazo.com/b503dea32cac22f0f57b13ab4cb56cd5
(This is soldier's taunt01)
Can I fix this problem?

I want to attach other models on blender and other...

I imported "steamapps\common\sourcesdk_content\tf\modelsrc\player\heavy\animations\dmx\taunt02.dmx".
"weapon_bone" and some other bones will not be bone.
I try to import mesh first, but it is the same result.
Is there a bug or other way?