Blocked Email Extensions

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.

  • .ade - Access Project Extension (Microsoft)
  • .asd - Microsoft Advanced Streaming Format description file
  • .asf - Microsoft Advanced Streaming Format
  • .adp - Access Project (Microsoft)
  • .app - Executable Application
  • .asp - Active Server Page
  • .asx - Windows Media Audio/Video
  • .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
  • .dll - Dynamic-link library file
  • .docm - Word Open XML Macro-Enabled Document
  • .exe - Executable File
  • .fxp - FoxPro Compiled Source (Microsoft)
  • .gadget - Windows Vista Gadget
  • .hlp - Windows Help File
  • .hta - Hypertext Application
  • .hto - Hierarchical Tagged Objects file
  • .inf - Information or Setup File
  • .ini - Initialization 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
  • .lib - Library file
  • .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
  • .ocx - Object Linking and Embedding (OLE) custom control
  • .ost- Offline Storage File - Outlook
  • .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)
  • .sh - Shell script (Unix)
  • .shb - Windows Shortcut into a Document
  • .shs - Shell Scrap Object File
  • .sys - System file (Generic)
  • .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
  • .vcs - Library for generic Version Control System
  • .vsmacros - Visual Studio .NET Binary-based Macro Project (Microsoft)
  • .vsw - Visio Workspace File (Microsoft)
  • .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
  • .ws - Windows Script File
  • .wsc - Windows Script Component
  • .wsf -Windows Script File
  • .wsh - Windows Script Host Settings File
  • .xnk - Exchange Public Folder Shortcut

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