With Filestar you get 0 different skills for working productively with Unity Asset Bundle (.unity3d) files.
About .Unity3d
Name
Unity Asset Bundle
Extension
.unity3d
Format
Binary
Category
Game
Developer
Unity Technologies
Description
A Unity asset bundle (.unity3d): a UnityFS container of serialized asset files (textures, audio, models). Unity 3/4 web-player bundles (UnityWeb/UnityRaw) are detected but not read yet.