Microsoft KB Archive/920785

= Attachments that are allowed by Outlook 2007 may be blocked by Windows SharePoint Services 3.0 =

Article ID: 920785

Article Last Modified on 11/20/2007

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APPLIES TO


 * Microsoft Office Outlook 2007
 * Microsoft Windows SharePoint Services 3.0
 * Microsoft Office SharePoint Server 2007

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SYMPTOMS
When you connect a Microsoft Windows SharePoint Services 3.0 site to Microsoft Office Outlook 2007, attachments that are allowed by Outlook 2007 may be blocked by the Windows SharePoint Services site. Additionally, attachments that are allowed by Windows SharePoint Services 3.0 may be blocked by Outlook 2007.

When this issue occurs, Outlook 2007 users may receive any of the following messages:

Outlook blocked access to the following potentially unsafe attachments:

The file cannot be previewed. Try opening the file in the program in which it was created.

This item contains attachments that are potentially unsafe. Recipients using Microsoft Outlook may not be able to open these attachments.

SharePoint users who are not using Outlook 2007 may receive the following message:

The file you are attempting to save or retrieve has been blocked from this Web site by the server administrators.



CAUSE
Windows SharePoint Services 3.0 enables administrators to block certain types of attachments. Policies that control which file types are allowed as attachments are not synchronized between Outlook 2007 and Windows SharePoint Services. Therefore, Windows SharePoint Services may not block the same attachments that Outlook 2007 blocks.



MORE INFORMATION
By default, Outlook 2007 and Windows SharePoint Services 3.0 block the following file types.

Outlook 2007

 * .ade
 * .adp
 * .app
 * .asp
 * .bas
 * .bat
 * .cer
 * .chm
 * .cmd
 * .com
 * .cpl
 * .crt
 * .csh
 * .der
 * .exe
 * .fxp
 * .hlp
 * .hta
 * .inf
 * .ins
 * .isp
 * .its
 * .js
 * .jse
 * .ksh
 * .lnk
 * .mad
 * .maf
 * .mag
 * .mam
 * .maq
 * .mar
 * .mas
 * .mat
 * .mau
 * .mav
 * .maw
 * .mda
 * .mdb
 * .mde
 * .mdt
 * .mdw
 * .mdz
 * .msc
 * .msh
 * .msh1
 * .msh2
 * .msh1xml
 * .msh2xml
 * .mshxml
 * .msi
 * .msp
 * .mst
 * .ops
 * .pcd
 * .pif
 * .plg
 * .prf
 * .prg
 * .pst
 * .reg
 * .scf
 * .scr
 * .sct
 * .shb
 * .shs
 * .tmp
 * .url
 * .vb
 * .vbe
 * .vbs
 * .vsmacros
 * .vsw
 * .ws
 * .wsc
 * .wsf
 * .wsh

Windows SharePoint Services 3.0

 * .ade
 * .adp
 * .app
 * .asa
 * .ashx
 * .asmx
 * .asp
 * .bas
 * .bat
 * .cdx
 * .cer
 * .chm
 * .class
 * .cmd
 * .com
 * .config
 * .cpl
 * .crt
 * .csh
 * .dll
 * .exe
 * .fxp
 * .hlp
 * .hta
 * .htr
 * .htw
 * .ida
 * .idc
 * .idq
 * .ins
 * .isp
 * .its
 * .jse
 * .ksh
 * .lnk
 * .mad
 * .maf
 * .mag
 * .mam
 * .maq
 * .mar
 * .mas
 * .mat
 * .mau
 * .mav
 * .maw
 * .mda
 * .mdb
 * .mde
 * .mdt
 * .mdw
 * .mdz
 * .msc
 * .msh
 * .msh1
 * .msh2
 * .msh1xml
 * .msh2xml
 * .mshxml
 * .msi
 * .msp
 * .mst
 * .ops
 * .pcd
 * .pif
 * .prf
 * .prg
 * .printer
 * .pst
 * .reg
 * .rem
 * .scf
 * .scr
 * .sct
 * .shb
 * .shs
 * .shtm
 * .shtml
 * .soap
 * .stm
 * .url
 * .vb
 * .vbe
 * .vbs
 * .ws
 * .wsc
 * .wsf
 * .wsh

Windows SharePoint Services 3.0 administrators can modify which file types are blocked as attachments. To modify the file types, follow these steps.

Note This setting applies to all SharePoint Web applications that run on the Windows SharePoint Services 3.0 server.
 * 1) On the Windows SharePoint Services 3.0 server, click Start, point to Administrative Tools, and then click SharePoint 3.0 Central Administration.
 * 2) Click the Operations tab.
 * 3) Under Security Configuration, click Blocked file types.
 * 4) On the Blocked File Types page, click the Web application that you want to configure in the Web Application box.
 * 5) To block or allow a file type, perform one of the following actions:
 * 6) * To block a type of file, type the file name extension on a new blank line in the list of file name extensions.
 * 7) * To allow a blocked file type, select the file type, and then press DELETE.
 * 8) When you are finished blocking or allowing file types, click OK.

Additional query words: OL2007 Outlook2007 WSSv3

Keywords: kbtshoot kbprb KB920785

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