Opens a specified file and returns a TextStream object that can be used to read from, write to, or append to the file.
| Value | Description | 
|---|---|
| ForAppending | Open a file and write to the end of the file. | 
| ForReading | Open a file for reading only. You can't write to this file. | 
| ForWriting | Open a file for writing. If a file with the same name exists, its previous contents are overwritten. | 
| Value | Description | 
|---|---|
| TristateFalse | Opens the file as ASCII. | 
| TristateMixed | n/a | 
| TristateTrue | Opens the file as Unicode. | 
| TristateUseDefault | Opens the file using the system default. |