open()

TW.app.open();

Presents the open file dialogue.

From that point scripting looses 'contact' with the function.

Does not receive a file filter nor a suggested file name, but will not allow the dialogue "Ok" button to be enabled unless the User chooses an actual file.

Upon success, opens the chosen file in a new editor window, (returns no value — for neither success nor failure).

That editor window does not become the new TW.target.

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