Office 2003 Tweaks - Opening Attachments with Outlook 2003

Outlook 2003 allow the user to use a registry key to open up access to blocked attachments. (Always make a backup before editing the registry.) 

To do this, follow the next steps:

  1. Open the registry editor Start -> Run, type regedit and click OK.
  2. Expand HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security (change 10.0 to 9.0 for Outlook 2000 SP3 or to 11.0 for Outlook 2003) (see picture 1).
    Picture 1

  3. Under that key, add a new string value named "Level1Remove".
  4. For the value for Level1Remove, enter a semicolon-delimited list of file extensions. For example, entering this:


    would unblock Microsoft Access files and Internet shortcuts. Note that the use of a leading dot was not previously required, however, new security patches may require it. If you are using  "mdb;url" format and extensions are blocked, add a dot to each extension. Note also that there is not a space between extensions.
  5. The modifications you made will be in effect after you restart Outlook.



Lex van der Horst

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