27 April, 2013

Cannot upload files with Extension. Blocked file types

Need not get Panic if at all you are not able to upload a file with these extensions . There are some of them which are blocked by default . and changes can be made easily.

Why Are these files Blocked ?
Its nothing but security Threats to confidential Data .

By default, many file types are blocked, including file types that are treated as executable by Internet Explorer. Files, whose names include braces, (for example, filename.{doc}) 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

 Add or remove blocked file types


Use this procedure when you want to prohibit files of a specific type from being saved or retrieved from any Web application on a server.

To add or remove blocked file types by using Central Administration

  1. Verify that you have the following administrative credentials.
    • You must be a farm administrator on the server.
  2. In Central Administration, click Security.
  3. On the Security page, in the General Security section, click Define blocked file types.
  4. On the Blocked File Types page, if you want to change the selected Web application, on the Web Application menu, click Change Web Application. Use the Select Web Application page to select a Web application.
  5. Do one of the following:
    • To block an additional file type, scroll to the bottom of the Type each file extension on a separate line text box, type the file extension you want to block, and then click OK.
    • To stop blocking a file type, select a file type from the list, press the Delete key, and then click OK.


      Note : You do not have to type a file extension in the list in alphabetical order. The next time you open the list, the file extension you added will be correctly sorted in alphabetical order.

      Reference : http://technet.microsoft.com/en-us/library/cc287701%28v=office.14%29.aspx

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Your feedback is always appreciated. I will try to reply to your queries as soon as possible- Amol Ghuge

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