Error opening attachments - cleaning out the Temporary Outlook Files folder

When trying to open an attachment in Microsoft Outlook, you receive the following error:

Cannot create file: FAX.TIF. Right-click the folder you want to create the file in, and then click Properties on the shortcut menu to check your permissions for the folder.

In my case, it was a TIF file;  the actual error will reflect the type of file you are trying to open.

The solution is to empty the Outlook Secure Temp Folder:

Source 1: Microsoft Answers

Source 2: How-To Outlook