Microsoft Outlook blocks more extensions

Microsoft Outlook blocks more extensions – 38 extensions added

Microsoft Outlook Blocks

Electronic communication is an intergral part of an enterprise’s infrastructure.

Microsoft Outlook blocks more extensions that can no longer be attached as email attachments.  When communicating with others, files often need to be sent.  If they fall into this list, and the recipient is an Outlook user they will not be able to access these attachments.

The new ones to be added are are:

  • Java files: “.jar”, “.jnlp”
  • Python files: “.py”, “.pyc”, “.pyo”, “.pyw”, “.pyz”, “.pyzw”
  • PowerShell files: “.ps1”, “.ps1xml”, “.ps2”, “.ps2xml”, “.psc1”, “.psc2”, “.psd1”, “.psdm1”, “.psd1”, “.psdm1”
  • Digital certificates: “.cer”, “.crt”, “.der”
  • Files used to exploit vulnerabilities in third-party software: “.appcontent-ms”, “.settingcontent-ms”, “.cnt”, “.hpj”, “.website”, “.webpnp”, “.mcf”, “.printerexport”, “.pl”, “.theme”, “.vbp”, “.xbap”, “.xll”, “.xnk”, “.msu”, “.diagcab”, “.grp”

There currently 104 extensions that are blocked.  The new total of extenstions that will be blocked will be upped to 142.  The current list includes:

  • .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
  • .cnt – Microsoft Help Workshop Application
  • .com – Command
  • .cpl – Windows Control Panel Extension (Microsoft)
  • .crt – Certificate File
  • .csh – csh Script
  • .der – DER Encoded X509 Certificate File
  • .diagcab – Microsoft Support diagnostic tools
  • .exe – Executable File
  • .fxp – FoxPro Compiled Source (Microsoft)
  • .gadget – Windows Vista gadget
  • .grp – Microsoft program group
  • .hlp – Windows Help File
  • .hpj – AppWizard Help project
  • .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”
  • .jar – Java Archive
  • .jnlp – Java Network Launch Protocol
  • .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)
  • .mcf – Media Container Format
  • .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 – Microsoft Shell
  • .msh1 – Microsoft Shell
  • .msh2 – Microsoft Shell
  • .mshxml – Microsoft Shell
  • .msh1xml – Microsoft Shell
  • .msh2xml – Microsoft Shell
  • .msi – Windows Installer File (Microsoft)
  • .msp – Windows Installer Update
  • .mst – Windows SDK Setup Transform Script
  • .msu – Windows Update file
  • .ops – Office Profile Settings File
  • .osd – Open Software Description
  • .pcd – Visual Test (Microsoft)
  • .pif – Windows Program Information File (Microsoft)
  • .pl – Perl script
  • .plg – Developer Studio Build Log
  • .prf – Windows System File
  • .prg – Program File
  • .printerexport – Printer backup file
  • .ps1 – Windows PowerShell
  • .ps1xml – Windows PowerShell
  • .ps2 – Windows PowerShell
  • .ps2xml – Windows PowerShell
  • .psc1 – Windows PowerShell
  • .psc2 – Windows PowerShell
  • .psd1 – Windows PowerShell
  • .psdm1 – 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
  • .theme – Desktop theme file settings
  • .tmp – Temporary File/Folder
  • .url – Internet Location
  • .vb – VBScript File or Any Visual Basic Source
  • .vbe – VBScript Encoded Script File
  • .vbp – Visual Basic project file
  • .vbs – VBScript Script File – Visual Basic for Applications Script
  • .vsmacros – Visual Studio .NET Binary-based Macro Project (Microsoft)
  • .vsw – Visio Workspace File (Microsoft)
  • .webpnp – Internet printing file
  • .website – Pinned site shortcut from Internet Explorer
  • .ws – Windows Script File
  • .wsc – Windows Script Component
  • .wsf – Windows Script File
  • .wsh – Windows Script Host Settings File
  • .xbap – Browser applications
  • .xll – Excel add-in
  • .xnk – Exchange Public Folder Shortcut

 

 

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Victor Janulaitis
M. Victor Janulaitis is the founder and CEO of Janco Associates. His focus and that of the firm is the management and support of IT professionals improving infrastructure. His expertise is in organizational infrastructure, security, cost control, disaster recovery business continuity; information privacy; and staff development.

Mr. Janulaitis has been an expert witness in several employment and termination lawsuits. He is considered an expert on discrimination, job content, compensation, and employee performance.
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About Victor Janulaitis

M. Victor Janulaitis is the founder and CEO of Janco Associates. His focus and that of the firm is the management and support of IT professionals improving infrastructure. His expertise is in organizational infrastructure, security, cost control, disaster recovery business continuity; information privacy; and staff development. Mr. Janulaitis has been an expert witness in several employment and termination lawsuits. He is considered an expert on discrimination, job content, compensation, and employee performance.

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