If you see the “The file couldn’t open in protected view” error while opening Microsoft Excel, the solutions listed in this post may help you resolve the issue ...

If you are unable to open an Excel, Word, or PowerPoint attachment from Microsoft Outlook or a file from the Internet, and you get an error message, The file is ...

We need to import data from Excel file from our client. Recently we migrated to ClosedXML from EPPlus due to the change of license. The migration progress is quite smoothly until the acceptance test ...

Here's what worked for me: Try this fix first: Open Excel, go to File > Options > Trust Center > Trust Center Settings > Protected View, and uncheck all the boxes under Protected View. Then restart ...