# subsystemImplementationType

> The System.Type of the subsystem implementation associated with this descriptor.

## Definition

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

> **Warning:**
>
> **Deprecated.** Use SubsystemDescriptorWithProvider instead.

```csharp
public Type subsystemImplementationType { get; set; }
```