Step 5.Now, note down the folder's location by double-clicking the key name on the right panel. Step 4.Locate the registry key that contains the actual folder location. Type OutlookSecureTempFolder in the Find dialog box and click the Find Next option. Click on Edit and then opt for the Find option. 
Step 2.Type regedit.exe in the Run box and click OK to open the Registry Editor.Step 1.Click Start, search, and select the Run option.
Solution I: When the cause of the error is associated with Temporary Internet folders:
When a user is not able to access attachments through Office 365 using Outlook Web App, Outlook Web App blocks attachments having some specific file extensions. After a certain period, Outlook denies saving temporary files of the same filename at the temporary location. In this case, multiple temporary files carrying the same filename are created in the Temporary file folder. When a user repetitively access the same Outlook attachment(s). When a user tries to open Outlook attachments while Outlook PST files are in a corrupt or inaccessible state. Thus, the Outlook attachments get automatically locked, displaying either of the above-displayed errors. Outlook denies permission to access suspicious attachments due to the default security protocols, which may harm the user's Outlook database or other system files severely. This error occurs when a subfolder, which contains default copies of temporary Internet files, has reached its storage limit. When a user is restricted to access temporary Internet files and folders on the local system or the server. The most common reasons for facing such unwanted error message are: We will take you through this blog to help you fix the issue. The application instead throws an error - "Unable to Open Outlook Attachment." Simple hacks like restarting your Outlook application do not fix the issue, and attachment remains inaccessible even after the restart of the application. Right-clicking the attachment and clicking on the 'Save as' option also doesn't seem to work. In this problem, users are not able to open Outlook attachments by double-clicking on them. It would be highly appreciated if you provide us additional information and the exact error message (if any) so that we can further assist you.Microsoft Outlook users have reported an issue that prevents them from accessing the mail attachments. Issue persists, don't hesitate to contact us again. You may also find the article below helpful. To get the best browsing experience for SkyDrive, People and, please refer to this #UNABLE TO OPEN ATTACHMENTS IN OUTLOOK 2016 UPGRADE#
Is also highly recommended that you upgrade your browser to the latest version. After optimizing, re-launch your browser and check if you encounter the same problem. This will also serve as an initial troubleshooting step to improve browser performance. To make sure that it isn’t contributing to this issue (click here That you are experiencing this issue because of your browser.
Have you tried it on a different computer?. Does this happen when you try accessing your account from the same computer with a different browser?. Please reply with the answers to the following questions: We would like to ask a few questions so we can isolate the issue that you are encountering. I understand that you can’t open or save an attachment that’s been sent to you. Thank you for bringing the issue to our attention.
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