Where are Outlook Temporary files Stored? Right-click the folder that you want to create the file in and then click Properties on the shortcut menu to check your permissions for the folder. You will find the following error message when you try to open or save any attachments:Ĭannot create file: file name. Outlook 2016 and Outlook 2019 users do not face this issue as they are handled better here. This issue is quite common in Outlook versions like Outlook 2007, Outlook 2013 where attachments fail to open. This continues to become an issue when the Outlook temp folder is full and you need to clear it manually. Every time, you close the mail without closing the attachment, the attachment file will not be cleared from the Outlook temp cache folder. OutlookSecureTempFolder or also called as Outlook temporary folder is used to store files like attachments when you open them in Outlook.