UnSafe File Attachments for Microsoft Outlook
Outlook and Outlook Express include security features that block file attachments that are considered unsafe. If you receive an e-mail message that contains one of the blocked file types, you may receive the following warning message: "Outlook blocked access to the following potentially unsafe attachments:" or "OE has deleted the attached unsafe documents".
The following is a list of unsafe attachments as determined by Microsoft: Level 1 ("Unsafe") The "unsafe" category represents any extension that may have script or code associated with it. You cannot open any attachment with an "unsafe" extension if you use a version of Outlook that has the security patch applied to it. The following list contains attachments that are considered unsafe:
| File Extension | File Type |
| .ade | Microsoft Access project extension |
| .adp | Microsoft Access project |
| .asx | Windows Media Audio / Video |
| .bas | Microsoft Visual Basic class module |
| .bat | Batch file |
| .chm | Compiled HTML Help file |
| .cmd | Microsoft Windows NT Command script |
| .com | Microsoft MS-DOS program |
| .cpl | Control Panel extension |
| .crt | Security certificate |
| .exe | Program Executable |
| .hlp | Help file |
| .hta | HTML program |
| .inf | Setup Information |
| .ins | Internet Naming Service |
| .isp | Internet Communication settings |
| .js | JScript file |
| .jse | Jscript Encoded Script file |
| .lnk | Shortcut |
| .mda | Microsoft Access add-in program |
| .mdb | Microsoft Access program |
| .mde | Microsoft Access MDE database |
| .mdt | Microsoft Access workgroup information |
| .mdw | Microsoft Access workgroup information |
| .mdz | Microsoft Access wizard program |
| .msc | Microsoft Common Console document |
| .msi | Microsoft Windows Installer package |
| .msp | Microsoft Windows Installer patch |
| .mst | Microsoft Windows Installer transform; Microsoft Visual |
| .ops | Office XP settings |
| .pcd | Photo CD image; Microsoft Visual compiled script |
| .pif | Shortcut to MS-DOS program |
| .prf | Microsoft Outlook profile settings |
| .reg | Registration entries |
| .scf | Windows Explorer command |
| .scr | Screen saver |
| .sct | Windows Script Component |
| .shb | Shell Scrap object |
| .shs | Shell Scrap object |
| .url | Internet shortcut |
| .vb | VBScript file |
| .vbe | VBScript Encoded script file |
| .vbs | VBScript file |
| .wsc | Windows Script Component |
| .wsf | Windows Script file |
| .wsh | Windows Script Host Settings file |
Outlook may prevent you from opening files with these attachment extensions. UXB Internet will not allow the following attachments to be sent though our mail servers because they are the most dangerous and common ones used to transmit virus and worms:
| File Extension | File Type |
| .bat | Batch File |
| .pif | Shortcut to MS-DOS program |
| .vbs | VBScript file |
| .lnk | Shortcut |
| .com | Microsoft MS-DOS program |
| .exe | Program Executable |
| .scr | Screen saver |
| .url | Internet shortcut |
NOTE: As a courtesy, we provide information about how to use certain third-party products, but we do not endorse or directly support third-party products and we are not responsible for the functions or reliability of such products. All rights reserved.