Following are the extensions blocked from being sent through our e-mail systems. If you need to email an attachment with one of the following extensions, you can replace the actual extension with ".txt". You should include instructions in your email telling the recipient to replace the .txt extension with the true extension so they can open the attachment.

Outlook 2007, Outlook 2003 SP3 and Entourage 2004/2008 block the following attachments by default. Bolded attachments are not blocked in Outlook 2003 SP2 or earlier.

• .ade - Access Project Extension (Microsoft)
• .adp - Access Project (Microsoft)
• .app - Executable Application
• .asp - Active Server Page
• .bas - BASIC Source Code
• .bat - Batch Processing
• .cer - Internet Security Certificate File
• .chm - Compiled HTML Help
• .cmd - DOS CP/M Command File, Command File for Windows NT
• .com - Command
• .cpl - Windows Control Panel Extension (Microsoft)
• .crt - Certificate File
• .csh - csh Script
• .der - DER Encoded X509 Certificate File
• .exe - Executable File
• .fxp - FoxPro Compiled Source (Microsoft)
• .gadget - Windows Vista Gadget
• .hlp - Windows Help File
• .hta - Hypertext Application
• .inf - Information or Setup File
• .ins - IIS Internet Communications Settings (Microsoft)
• .isp - IIS Internet Service Provider Settings (Microsoft)
• .its - Internet Document Set, International Translation
• .js - JavaScript Source Code
• .jse - JScript Encoded Script File
• .ksh - UNIX Shell Script
• .lnk - Windows Shortcut File
• .mad - Access Module Shortcut (Microsoft)
• .maf - Access (Microsoft)
• .mag - Access Diagram Shortcut (Microsoft)
• .mam - Access Macro Shortcut (Microsoft)
• .maq - Access Query Shortcut (Microsoft)
• .mar - Access Report Shortcut (Microsoft)
• .mas - Access Stored Procedures (Microsoft)
• .mat - Access Table Shortcut (Microsoft)
• .mau - Media Attachment Unit
• .mav - Access View Shortcut (Microsoft)
• .maw - Access Data Access Page (Microsoft)
• .mda - Access Add-in (Microsoft), MDA Access 2 Workgroup (Microsoft)
• .mdb - Access Application (Microsoft), MDB Access Database (Microsoft)
• .mde - Access MDE Database File (Microsoft)
• .mdt - Access Add-in Data (Microsoft)
• .mdw - Access Workgroup Information (Microsoft)
• .mdz - Access Wizard Template (Microsoft)
• .msc - Microsoft Management Console Snap-in Control File (Microsoft)
• .msh - Windows PowerShell
• .msh1 - Windows PowerShell
• .msh2 - Windows PowerShell
• .mshxml - Windows PowerShell
• .msh1xml - Windows PowerShell
• .msh2xml - Windows PowerShell
• .msi - Windows Installer File (Microsoft)
• .msp - Windows Installer Patch
• .mst - Windows SDK Setup Transform Script
• .ops - Office Profile Settings File
• .pcd - Visual Test (Microsoft)
• .pif - Windows Program Information File (Microsoft)
• .plg - Developer Studio Build Log
• .prf - Outlook Profile file
• .prg - Program File
• .ps1 - Windows PowerShell
• .ps1xml - Windows PowerShell
• .ps2 - Windows PowerShell
• .ps2xml - Windows PowerShell
• .psc1 - Windows PowerShell
• .psc2 - Windows PowerShell
• .pst - MS Exchange Address Book File, Outlook Personal Folder File (Microsoft)
• .reg - Registration Information/Key for W95/98, Registry Data File
• .scf - Windows Explorer Command
• .scr - Windows Screen Saver
• .sct - Windows Script Component, Foxpro Screen (Microsoft)
• .shb - Windows Shortcut into a Document
• .shs - Shell Scrap Object File
• .tmp - Temporary File/Folder
• .url - Internet Location
• .vb - VBScript File or Any VisualBasic Source
• .vbe - VBScript Encoded Script File
• .vbs - VBScript Script File, Visual Basic for Applications Script
• .vsmacros - Visual Studio .NET Binary-based Macro Project (Microsoft)
• .vsw - Visio Workspace File (Microsoft)
• .ws - Windows Script File
• .wsc - Windows Script Component
• .wsf -Windows Script File
• .wsh - Windows Script Host Settings File
• .xnk - Exchange Public Folder Shortcut

The following are not blocked by Outlook or Entourage, but are on the Mirapoint e-mail system:

• .asd - Microsoft Advanced Streaming Format description file
• .asf - Microsoft Advanced Streaming Format
• .asx - Windows Media Audio/Video
• .dll - Dynamic-link library file
• .hto - Hierarchical Tagged Objects file
• .ini - Initialization file
• .lib - Library file
• .ocx - Object Linking and Embedding (OLE) custom control
• .sh - Shell script (Unix)
• .sys - System file (Generic)
• .vcs - Library for generic Version Control System
• .vxd - Virtual device driver (Microsoft Windows 9x)
• .wmd - Windows Media Download Package file
• .wms - Windows Media Download Package file
• .wmz - Windows Media Download Package file

The following are blocked by Entourage but not by Outlook:

• .APPL - Executable Application
• .command - Command Script File
• .dart - Dart Disk Image
• .dc42 - Disk Copy 4.2 Disk Image
• .devr - UDIF Raw Device Image
• .dImg - Disk Copy 4.2 Disk Image
• .dimg, .hdcm, .hdro, .rohd - NDIF Disk Image
• .diskcopy42 - Disk Copy 4.2 Disk Image
• .DMdf, .DMd0-.DMd7 - DART Disk Image
• .download - Safari Download File
• .dseg - NDIF Disk Image Segment
• .hdrv - Raw Disk Image
• .ilht - Safari Web Location
• .img - NDIF Disk Image
• .imgpart - NDIF Disk Image Part
• .keychain - All Keychain Items
• .mpkg - Installer Metapackage
• .ndif - NDIF Disk Image
• .oneb - Self-mounting Image
• .OPCD - PC Drive Controller
• .osas - Compiled AppleScript
• .p10 - All Keychain Items
• .p12 - All Keychain Items
• .pem - All Keychain Items
• .pfx - All Keychain Items
• .PImg - DVD Master
• .pkg - Installer Package
• .pkg1 - Installer Package
• .p - Perl Script file
• .scpt - Compiled AppleScript
• .smi - Self-Mouting Image
• .sparseimag - Sparse Disk Image
• .term - Windows Terminal Script file
• .trm - Terminal Script File
• .udif - UIDF Disk Image
• .webloc - Safari Web Location