# CoTreatAsClass

```csharp
[DllImport("ole32.dll", SetLastError = true)]
public static extern int CoTreatAsClass(
   ref Guid clsidOld,
   ref Guid clsidNew
);
```

Microsoft documentation: [Link](https://learn.microsoft.com/en-us/windows/win32/api/objbase/nf-objbase-cotreatasclass)
