# UNKNOWN

> The audio file you want to stream has a file format that is unknown to Unity.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
UNKNOWN = 0
```

### Remarks

Use this audio type for files with an extension the other audio types don’t cover. If the audio file has a different format to the AudioType you choose, Unity might not play the audio correctly. **Note**: Avoid audio types that are unknown to Unity because Unity might not support them.