* @param ok_not_exists if set to true returns also non existent files
* (useful for save). Defaults to false *)
method chooseFile: ?ok_not_exists:bool -> unit -> string option
* @param ok_not_exists if set to true returns also non existent files
* (useful for save). Defaults to false *)
method chooseFile: ?ok_not_exists:bool -> unit -> string option