![]() However, at this point in time the Open XML SDK does not provideįunctionality to open or create files with Compound File protection (CFB document). ![]() NET to create the documents programmatically. To programmatically create or modify OOXML documents you may use the System.IO.Packaging namespace in. Subsequently, the UI protected document will open within the Office UI but you cannot rename the file extension to *.zip and browse it with Explorer. When you create a password protected document in the Office User Interface (UI) you will find that it becomes a Microsoft Compound File Binary File Format (MS-CFB) document (not a ZIP package), though the file extension does not change (e.g., xlsx, docx, pptx). In my option, you could not protect an Excel file with openxml. ![]() How to create a document with openxml and C# that will pop up a password prompt when open an excel file.
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