# WOPIClientAdditionalData

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Reference](https://developer.m-files.com/APIs/gRPC-API/Reference/index.md) > [Messages](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.WOPIClientAdditionalData/

Struct for WOPI Client Additional Data.

- **Full name:** `MFiles.WOPIClientAdditionalData`
- **Proto file:** [`mfiles/structs.proto`](https://developer.m-files.com/APIs/gRPC-API/downloads/proto/mfiles/structs.proto)

<a id="fields"></a>

## Fields

| Field | Type | Number | Description |
|---|---|---|---|
| <a id="f-return_uri"></a>`return_uri` | `string` | 1 | The Return URL. |
| <a id="f-main_app_url"></a>`main_app_url` | `string` | 2 | The Main Appp URL. |
| <a id="f-wopi_end_point"></a>`wopi_end_point` | `string` | 3 | The WOPI Endpoint. |
| <a id="f-culture_identifier"></a>`culture_identifier` | `string` | 4 | The Culture identifier. |
| <a id="f-action_url"></a>`action_url` | `string` | 5 | The action URL. |
| <a id="f-host_edit_url"></a>`host_edit_url` | `string` | 6 | The Host edit URL. |

<a id="used-in-fields"></a>

## Used in fields

- [`WOPIUserSession.additional_data`](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.WOPIUserSession/index.md#f-additional_data): WOPI Client Additional data.