Desribes an externally referenced file. This is returned as part of the WriteResult when writing a serialized file.
| filePath | The path of the file that is referenced. |
| guid | A GUID that represents the file being referenced. This GUID might be used to locate default editor resources, but generally pathName is used to identify externally referenced files. |
| type | The lookup resolution index for the GUID field in the editor. This is used in conjunction with the GUID internally and should not be modified. |