Excel invalid file extension

Describes the cause and action for error messages.


Error Message(English):
invalid file extension

Resolution


関連リンク


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https://www.slideshare.net/fileextension/repair-file-extension-errors-and-related-issues

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https://social.technet.microsoft.com/Forums/windowsserver/ja-JP/3502b050-574e-4b72-88f4-049068985591・・・

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https://www.c-sharpcorner.com/article/file-upload-extension-validation-in-asp-net-mvc-and-javascript・・・



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