Microsoft Office's Outlook was designed to block certain file extensions from opening due to possible malicious code. A simple edit of the registry will allow you to specify which file attachments Outlook should not block.
1) Open regedit
2) Goto HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security
3) Create a new String value called Level1Remove
4) In the Value Data field type the file extension you wish to unblock.
To specify multiple file extensions separate each extension with a semicolon. Ex: .mdb;.bat;.exe
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