To remove the block for a downloaded file, right-click the file in File Explorer, select Properties, and then select Unblock. Note: The change might not take effect immediately but will be effective after the next login.

To help protect your security and privacy, Microsoft Office is configured by default to block external content—such as images, linked media, hyperlinks, and data connections—in workbooks and presentations.

Learn more about why Microsoft 365 users can't open or view attachments in Outlook on the web. There are several ways to send and receive a blocked file.

Some icons in My Computer, in Windows Explorer, on the desktop, or on the Quick Launch Bar change randomly. Troubleshoots and fixes common issues with file and folder operations in Windows.

Use the Information Protection viewer to view protected files in Windows, Android, iOS, or Edge.

Block you from uninstalling a program through Add or Remove Programs (or Programs and Features) in Control Panel. If you're trying to remove malware, you can use Windows Security (or another antivirus tool), or you can use the Windows Malicious Software Removal tool.

Microsoft Defender's web protection helps protect you against malicious sites that are being used for phishing or spreading malware. Available on Windows, Android, and iOS.

Learn how to block someone or add email addresses to the safe senders list in Outlook on the web.

Learn how to open encrypted emails. Outlook protected messages have a banner at the top of the message that informs you of restrictions. Outlook should open the message like normal. Otherwise, follow instructions for opening encrypted or protected mail.

To protect yourself, your computer, and your organization, the best option is to delete the file. From the OneDrive mobile app, your only option is to delete the file. Select the file you want to delete (on the mobile app, select the More icon next to the file). Select Delete.