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Manage blocked file types (Office SharePoint Server)

Applies To: Office SharePoint Server 2007

You can restrict files from being uploaded or downloaded by basing the restriction on their file name extension. For example, you can block files that have the .exe extension because such files can be run on the client computer and may contain malicious software.

By default, many file types are blocked, including file types treated as executable by Windows Explorer. Files with braces ({}) are also blocked by default.

The following table shows the file types that are blocked by default and their corresponding file name extensions.

File name extension File type

.ade

Microsoft Access project extension

.adp

Microsoft Access project

.app

Application file

.asa

ASP declarations file

.ashx

ASP.NET Web handler file. Web handlers are software modules that handle raw HTTP requests received by ASP.NET.

.asmx

ASP.NET Web Services source file

.asp

Active Server Pages

.bas

Microsoft Visual Basic class module

.bat

Batch file

.cdx

Compound index

.cer

Certificate file

.chm

Compiled HTML Help file

.class

Java class file

.cmd

Microsoft Windows NT command script

.com

Microsoft MS-DOS program

.config

Configuration file

.cpl

Control Panel extension

.crt

Security certificate

.csh

Script file

.dll

Windows dynamic-link library

.exe

Program

.fxp

Microsoft Visual FoxPro compiled program

.hlp

Help file

.hta

HTML program

.htr

Script file

.htw

HTML document

.ida

Internet Information Services file

.idc

Internet database connector file

.idq

Internet data query file

.ins

Internet Naming Service

.isp

Internet Communication settings

.its

Internet Document Set file

.jse

JScript Encoded script file

.ksh

Korn Shell script file

.lnk

Shortcut

.mad

Shortcut

.maf

Shortcut

.mag

Shortcut

.mam

Shortcut

.maq

Shortcut

.mar

Shortcut

.mas

Microsoft Access stored procedure

.mat

Shortcut

.mau

Shortcut

.mav

Shortcut

.maw

Shortcut

.mda

Microsoft Access add-in program

.mdb

Microsoft Access program

.mde

Microsoft Access MDE database

.mdt

Microsoft Access data file

.mdw

Microsoft Access workgroup

.mdz

Microsoft Access wizard program

.msc

Microsoft Common Console document

.msh

Microsoft Agent script helper

.msh1

Microsoft Agent script helper

.msh1xml

Microsoft Agent script helper

.msh2

Microsoft Agent script helper

.msh2xml

Microsoft Agent script helper

.mshxml

Microsoft Agent script helper

.msi

Microsoft Windows Installer package

.msp

Windows Installer patch package file

.mst

Visual Test source files

.ops

Microsoft Office profile settings file

.pcd

Photo CD image or Microsoft Visual Test compiled script

.pif

Shortcut to MS-DOS program

.prf

System file

.prg

Program source file

.printer

Printer file

.pst

Microsoft Outlook personal folder file

.reg

Registration entries

.rem

ACT! database maintenance file

.scf

Windows Explorer command file

.scr

Screen saver

.sct

Script file

.shb

Windows shortcut

.shs

Shell Scrap object

.shtm

HTML file that contains server-side directives

.shtml

HTML file that contains server-side directives

.soap

Simple Object Access Protocol file

.stm

HTML file that contains server-side directives

.url

Uniform Resource Locator (Internet shortcut)

.vb

Microsoft Visual Basic Scripting Edition file

.vbe

VBScript Encoded Script file

.vbs

VBScript file

.ws

Windows Script file

.wsc

Windows Script Component

.wsf

Windows Script file

.wsh

Windows Script Host settings file

  1. On the Operations page, in the Security Configuration section, click Blocked file types.

  2. On the Blocked File Types page, type on separate lines in the text box the file extensions that you want to block.

  3. To remove a blocked file name extension, delete the extension in the text box.

  4. Click OK.

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