Issue 1Assume that you open an Office document that contains an app for Office or try to use a mail app in Microsoft Outlook. However, the app does not start, and you receive the following error message:
This app could not be started. Close this dialog to ignore the problem or click "Restart" to try again.
Issue 2When you try to play a video in a Microsoft Word document, the video does not play, and you receive the following error message:
This video could not be started. Close this dialog to ignore the problem or click "Restart" to try again.
2986156 May 12, 2015, update for Office 2013
Re-enable protected mode for Restricted Sites:
- In Internet Explorer, click the Tools button, and then click Internet Options.
- Click the Security tab, and then select the Restricted Sites Zone.
- Select the Enable Protected Mode check box, and then click OK.
- Restart Internet Explorer.
Microsoft Office addins using the Apps for Office platform are designed to run in isolation, using a low rights sandbox. Several features, such as the task pane view, use web views provided using Internet Explorer APIs. To ensure these components execute HTML script in low rights mode, Office explicitly requires the browser object to run in Protected Mode. Currently, IE does not support this from the API unless Protected Mode is enabled for Restricted Sites zone in IE itself. This is typically not a problem since this is the default setting, and rarely will users disable it. However, if disabled (by user action or by GPO), these Office addin types may report an error when starting and refuse to load. It is an expected failure under that condition, and is blocked for security reasons.
For more information about protected mode, go to the following Microsoft website: