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# archiveExtension

The standard filename extension for exported [`ARReferenceObject`](/documentation/ARKit/ARReferenceObject) instances.

```
class let archiveExtension: String
```

## Discussion

Use this filename extension when constructing a URL to save a reference object file with the [`export(to:previewImage:)`](/documentation/ARKit/ARReferenceObject/export(to:previewImage:)) method.

---

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