Email attachment blocked file extensions list

Browse file extensions by file type category:

Email attachment blocked file type extensions
(95 file extension database entries)

Group of file extensions and file types blocked by email clients such as Microsoft Outlook in email message attachments, in attempt to stop viruses and malicious software spreading through internet via email

List of common file extensions blocked by mail clients

Email attachment blocked file extension list

Group of file extensions and file types blocked by email clients such as Microsoft Outlook in email message attachments, in attempt to stop viruses and malicious software spreading through internet via email.

To help protect your computer, Microsoft Outlook does not allow you to receive files of certain types (such as .exe files) as attachments, because of their potential for introducing a virus into your computer. Outlook blocks these files by default.

Attachment file types blocked by Microsoft Outlook: There are two levels of attachment security. Access to Level 1 files is blocked and can't be changed. When you receive an attachment with a Level 2 file type, you will be prompted to save the file to your hard disk. If you use Microsoft Exchange Server, your system administrator can add or remove file types for both levels of e-mail security. If a file type is added to both levels, it will be treated as a Level 1 file type.

Sort by: Extension	Sort by: File type description
file extension eml	Email message
file extension exe	Program executable
file extension mdb	Microsoft Access database
file extension tmp	Temporary data
file extension lnk	Windows Shortcut
file extension asp	Active Server Page script page
file extension msi	Microsoft Windows Installer installation package
file extension js	JavaScript source code script
file extension scr	MS Windows screensaver
file extension bas	Basic source code
file extension ws	Microsoft Windows script
file extension bat	Batch file (executable)
file extension gadget	Windows sidebar gadget
file extension inf	Windows installation script
file extension app	Mac application package or core system service
file extension mde	Microsoft Access compiled database (application)
file extension fxp	Visual FoxPro compiled database
file extension mst	Windows Installer transform script
file extension com	Command executable
file extension prg	Program source data
file extension reg	Windows registry data
file extension vbs	Visual Basic script
file extension hta	HTML program
file extension chm	Microsoft compiled HTML help module
file extension vss	Microsoft Visio smartshapes data
file extension shs	Microsoft Windows Shell Scrap Object
file extension cnt	Help Contents data
file extension mdt	Microsoft Access database template
file extension ops	Microsoft Office profile settings
file extension cmd	Microsoft Windows command script
file extension abx	Corel WordPerfect Mail address book
file extension ade	Microsoft Access compiled project
file extension sct	Microsoft Windows script component
file extension jse	JScript encoded script
file extension pif	Microsoft Windows program information
file extension mat	Microsoft Access table shortcut
file extension vbe	Visual Basic encoded script
file extension adp	Microsoft Access project
file extension msc	Microsoft management console control data
file extension url	Internet Shortcut - URL - Uniform Resource Locator
file extension crt	Internet security certificate
file extension scf	Windows Explorer shell command file
file extension hlp	Help file
file extension plg	Microsoft Developer Studio build log
file extension mar	Microsoft Access report shortcut
file extension der	DER encoded internet security certificate
file extension vb	Microsoft Visual Studio Visual Basic script
file extension msp	Windows Installer patch
file extension isp	Internet Service Provider settings
file extension prg	Program
file extension ps1	Windows PowerShell cmdlet script
file extension mas	Microsoft Access stored procedures data
file extension vbp	Microsoft Visual Basic project
file extension mam	Microsoft Access macro shortcut
file extension mdw	Microsoft Access workgroup information
file extension mda	Microsoft Access add-in
file extension vst	Microsoft Visio flowchart
file extension maf	Microsoft Access form shortcut
file extension mav	Microsoft Access view data
file extension xnk	Microsoft Exchange shortcut
file extension wsc	Microsoft Windows scripting component
file extension mad	Microsoft Access module shortcut
file extension ksh	Unix shell script
file extension wsf	Windows Script
file extension shb	Microsoft Windows shortcut into a document
file extension mau	Media Attachment Unit data
file extension cer	Internet security certificate
file extension vsmacros	Microsoft Visual Studio binary-based macro project
file extension maq	Microsoft Access query shortcut
file extension hpj	Microsoft Win Help project
file extension wsh	Microsoft Windows Scripting Host data
file extension psc1	Microsoft Windows PowerShell console data
file extension vsw	Microsoft Office Visio 2010 web drawing
file extension mdz	Microsoft Access wizard template
file extension csh	csh script
file extension maw	Microsoft Access data access page
file extension ps2	Microsoft Windows Shell script
file extension msh1xml	Windows Power Shell script
file extension ps1xml	Microsoft Windows PowerShell display configuration
file extension app	Symbian OS application
file extension its	Internet document
file extension msh	Microsoft Shell script
file extension ps2xml	Windows PowerShell data
file extension psc2	Microsoft Windows PowerShell script
file extension ins	Microsoft Windows Internet Naming Service
file extension mshxml	Microsoft XML typedata
file extension msh2xml	Windows PowerShell script
file extension pcd	Microsoft Visual Test data
file extension msh1	Microsoft Shell script
file extension mag	Microsoft Access diagram shortcut
file extension app	ThecusOS application
file extension prf	Microsoft Profiler output
file extension msh2	Microsoft Shell script
file extension osd	SoftGrid program description
file extension ins	Microsoft IIS Internet communications settings

Email attachment blocked file extensions

Browse file extensions by file type category:

Email attachment blocked file extension list

Group of file extensions and file types blocked by email clients such as Microsoft Outlook in email message attachments, in attempt to stop viruses and malicious software spreading through internet via email.

Browse by extension type: