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Article ID: 555001 - Last Review: June 23, 2008 - Revision: 1.0

Outlook Web Access - Configure Attachment Blocking

Author: William Lefkovics MVP
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SUMMARY

Exchange Server 2003 allows attachment blocking for Outlook Web Access. Specific Attachments extensions are configured in the Registry on the Exchange Server
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How to Configure Attachment Blocking in Outlook Web Access on Exchange Server 2003

There are 2 levels of file attachments for Outlook Web Access.  Level1 attachments have file extensions that are prohibited from accessing by OWA.  Level2 attachments have file extensions that can be accessed, but only if saved to the client's file system first. OWA is installed with a default set of file extensions for the two levels as shown in the following registry keys:
 
Location: HKLM\System\CurrentControlSet\Services\MSExchangeWeb\OWA
Value: Level1FileTypes
Type: REG_SZ
Value Data: ade, adp, app, asx, bas, bat, chm, cmd, com, cpl, crt, csh, exe, fxp, hlp, hta, inf, ins, isp, js, jse, ksh, lnk, mda, mdb, mde, mdt, mdw, mdz, msc, msi, msp, mst, ops, pcd, pif, prf, prg, reg, scf, scr, sct, shb, shs, url, vb, vbe, vbs, wsc, wsf, wsh
 
Location: HKLM\System\CurrentControlSet\Services\MSExchangeWeb\OWA
Value: Level2FileTypes
Type: REG_SZ
Value Data: ade, adp, asx, bas, bat, chm, cmd, com, cpl, crt, exe, hlp, hta, htm, html, htc, inf, ins, isp, js, jse, lnk, mda, mdb, mde, mdz, mht, mhtml, msc, msi, msp, mst, pcd, pif, prf, reg, scf, scr, sct, shb, shs, shtm, shtml, stm, url, vb, vbe, vbs, wsc, wsf, wsh, xml, dir, dcr, plg, spl, swf
 
Attachments listed should be separated by a comma with no space.
 
 
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APPLIES TO
  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Exchange Server 2003 Standard Edition
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