>>290396835
Mesh folder has:
>Body.asset
>Body.asset.meta
That repeated for 3 total sets of files.

Assetbundles:
>Folder: customavatar.unity3d
>>_CustomAvatar.prefab
>>_CustomAvatar.prefab.meta

Avatar folder:
>Avatar.asset.meta
>Avatar.asset
That repeated for 1 more file.

>beyond the ability for a first-timer to repair
Yeah I'm aware. I think I can open this entire folder in Unity just fine. I tried in the past. So I'm sure this is just a unity package.