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Suppose you receive an email with one Word file attached. If you now try to preview this file.doc or .docx, the file will be processed by the Word component (16) on your system. In some scenarios Outlook may cause the following error when scanning this file if it is unable to preview this Word attachment:
This file cannot be displayed due to an error with the following preview image: Microsoft Word Preview. To open this file in your own program, double-click it.
This is a known problem and we have found that incorrect or invalid registry keys are the cause of this problem. When we analyze this symptom with Process Monitor, we observe that some registry keys returned with denied access generate the above error message. Now let’s see what these registry keys are and how to fix this problem by manipulation:
This file cannot be previewed due to an error with Microsoft Word Previewer in Outlook.
Errors in handling the registry can have a negative effect on your system. So be careful when editing registry entries and create a system restore point before continuing.
1 Press the Windows key + R combination, enter put in the Run dialog box and press Enter to open the editor Registry Editor.
2 Navigate to the left pane of Registry Editor here :
3 As shown in the window above, right-click Assist and select Delete. If this key exists, the problem occurs, so we must delete it.
You can now close the registry editor and reboot the system. After rebooting the system, you will notice that Outlook can now preview Word files without problem.