| Member | Value | Description |
|---|---|---|
| createAlways | 0 | If the file exists then replace the file, if it does not exist then create it. |
| createExisting | 1 | If the file exists then open it. If the file does not exist then throw an error. |
| createOpen | 3 | If the file exists then open the file, if it does not exist then create it. |
| createUnique | 2 | If the file exists then create a file with a unique name (a period and a number are appended to the filename). If it does not exist then create it. |