# Unknown

> Application install mode is unknown.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/7000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
Unknown = 0
```

### Remarks

[Application.installMode](/engine/7000.0/script-reference/unityengine/application/installmode.md) returns this value on platforms that provide no information about how the application was installed.