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Openai/69509ae0-53e8-8004-aaaa-2f999c8dda20
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===== 2) 同じ名前のブックを開けない ===== これも「同一インスタンス内のWorkbooksコレクション(や内部識別)の都合」が濃厚で、Microsoftの回答でも'''“同名ブックは同時に開けない→別インスタンスで開け”'''という回避策になっています。 Microsoft Learn<ref>{{cite web|title=Microsoft Learn|url=https://learn.microsoft.com/en-us/answers/questions/5168892/excel-cant-open-two-workbooks-with-same-name-at-th|publisher=Microsoft Learn|access-date=2025-12-29}}</ref> (ここはOSのMDI/SDIというより、Excel側の“インスタンス内一意”制約っぽい。)
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