How to block attachment file name extensions in Outlook?

Step 1: Select Start, select Run, type regedit, and then select OK.

Step 2: Locate and then select the key in the registry: HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security

Step 3: On the Edit menu, point to New, and then select String Value.

Step 4: Type Level1Add, and then press Enter.

Step 5: On the Edit menu, select Modify.

Step 6: Type , and then select OK.

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