Level 1 file extensions must be blocked and not removed.

From Microsoft Outlook 2010

SV-33583r1_rule Level 1 file extensions must be blocked and not removed.

Vulnerability discussion

Malicious code is often spread through e-mail. Some viruses have the ability to send copies of themselves to other people in the victim's Address Book or Contacts list, and such potentially harmful files can affect the computers of unwary recipients.

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Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Security Form Settings -> Attachment Security “Remove file extensions blocked as Level 1” to “Disabled”.

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