Outlook: “Can’t Create File” Error When Opening Excel File Attachment

1.  Create a new folder in C:/ Drive with name "temp0"  path should be C:\temp0

2.    Hold the Windows Key, then press “R” to bring up the Run dialog box.

3.    Type “Regedit“, then press “Enter“.

4.   Go to the following location:-  "HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security\" entry. Double-click "OutlookSecureTempFolder" and change the "Value Data" field to the location of the folder you created, e.g. "C:\temp0"