Blocked Extensions

File Extensions Blocked

Certain file extensions, usually three letters preceded by a dot after a file name, have been associated with various viruses. Because of this possible threat to our network and your data, the following file extensions are being blocked or quarantined.

The following attachment file extensions are Blocked by the Barracuda:


The following attachment file extensions are Quarantined by the Barracuda:

  • ade cpl ins msc scr wsc 
  • adp crt isp msi sct wsf 
  • bas dll js msp shb wsh 
  • bat exe jse mst shs zip 
  • chm hlp lnk pcd vb 
  • cmd hta mdb pif vbe 
  • com inf mde reg vbs

The attachment file extensions blocked by Outlook 2003 and Outlook 2000 service pack 3 are:

  • 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
  • exe Executable File
  • fxp FoxPro Compiled Source (Microsoft)
  • 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, Internet 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
  • 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)
  • 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)
  • prf Windows System File
  • prg Program File
  • 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)
  • vss Visio Stencil (Microsoft)
  • vst Visio Template (Microsoft)
  • vsw Visio Workspace File (Microsoft)
  • ws Windows Script File
  • wsc Windows Script Component
  • wsf Windows Script File
  • wsh Windows Script Host Settings File

If you know the person sending you the file in question and know that it is reliable, you can contact them and ask them to send the file back with a different extension. For example if I wanted to send an .mdb file (Access database extension) called MyDatabase.mdb to someone I could change it to Mydatabase.tb. In my e-mail to them I would note this and tell them to copy the database to a location where they want to use it and rename it MyDatabase.mdb.