Legacy Documentation: Version 2018.2 (Go to current version)
Managing Asset Dependencies in Unity 4
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Legacy Animation System

Prior to the introduction of Mecanim, Unity used a simpler animation system. For backward compatibility, this system is still available. The main reason for using legacy animation is to continue working with an old project without the work of updating it for Mecanim. However, it is not recommended that you use the legacy system for new projects.

Working with legacy animations

To import a legacy animation, you first need to select Legacy as the Animation Type in the Rig tab of the Import Settings window:

Rig tab on the Import Settings window
Rig tab on the Import Settings window

Make sure you enable the Import Animation option on the Animation tab.