Updated: July 9, 2020 (August 23, 2000)
Charts & IllustrationsUnsafe File Attachment Types
The chart below lists the file attachment types Microsoft deems unsafe in the most recent Outlook security patch. Should a file of any type listed below be embedded in an incoming message, it wont be accessible to Outlook users with the patch installed. (Ed. Note: Administrators have an ability to modify the list of unsafe file types.)
| File Extension | Description |
| ADE | Microsoft Access project extension |
| ADP | Microsoft Access project |
| BAS | Visual Basic class module |
| BAT | Batch file |
| CHM | Compiled HTML help file |
| CMD | Windows NT command script |
| COM | MS-DOS application |
| CPL | Control Panel extension |
| CRT | Security certificate |
| EXE | Application |
| HLP | Windows help file |
| HTA | HTML applications |
| INF | Setup information file |
| INS | Internet communication settings |
| ISP | Internet communication settings |
| JS | JScript file |
| JSE | JScript encoded script file |
| LNK | Shortcut |
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