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ダイアログの表示と入力されたファイル名の取得
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[ファイルの種類] ボックスに表示される選択肢を設定する
複数のドットが付いた拡張子をサポートする
ダイアログタイトルを設定する
既存のファイル名が入力されたときに警告を出すかどうかを設定する

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