Register Filter Pack IFilters with Exchange 2013

IFilter provides an interface to the Microsoft search indexing services to allow indexing of documents, file metadata, emails, email attachments, and lot other. Unless an appropriate IFilter exists search service / engine cannot index the files relevant to a missing IFilter. Exchange uses IFilters for the similar reasons and also to let some transport rules work correctly. Some transport rules can perform phrase or word based jobs and to perform it better, they should be able to read through content of an attachment. IFilters

Exchange 2013 transport rules supports multiple document formats by default. OneNote and Office Publisher are not supported by the transport rules though. That means an email going through an exchange 2013 server which contains a Onenote notebook attached to it may bounce back due to AttachmentUnsupported condition. So, if you want to support onenote and publisher file formats on exchange 2013 transport rules you should register the additional IFilters manually on an Exchange 2013 Mailbox Server.

To register IFilters with Exchange 2013 you can follow below steps:

Download Microsoft Office 2010 Filter Pack and Service Pack 1 for Microsoft Office Filter Pack 2010 (KB2460041) 64-bit Edition and install them one after another.

1. Now logon to your Exchange 2013 Mailbox Server Role, Open registry editor and locate the key -  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\HubTransportRole\CLSID

If a key named CLSID does not exist create one manually as shown in below figures. Below steps will demonstrate how to add the CLSID and filter for OneNote files.


2. Right click at the location HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\HubTransportRole\CLSID and create another new key named {B8D12492-CE0F-40AD-83EA-099A03D493F1} as show in below figure


3. Double click on the string value (Default) and set the path to where Office Filter Pack is installed. Default location of the filter pack is C:\Program Files\Common Files\Microsoft Shared\Filters


4. Right click at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\HubTransportRole\CLSID\{B8D12492-CE0F-40AD-83EA-099A03D493F1}  and create a new String Value and rename it to ThreadingModel and set its value to Both


5. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\HubTransportRole\filters. Again, if filters key does not exist create it manually.

6. Under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\HubTransportRole\filters create another key .one (please note a preceding dot)

7. Change the value of (Default) string value to {A7FD8AC9-7ABF-46FC-B70B-6A5E5EC9859A}


In last 7 steps we registered the IFilter for OneNote file types.

8. To add an IFilter for Publisher files add a key named .pub under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\HubTransportRole\filters and set the (Default) value to {A7FD8AC9-7ABF-46FC-B70B-6A5E5EC9859A}


Close the registry editor and restart following services on Exchange mailbox server.

  • Restart Microsoft Exchange Transport Service
  • Restart Microsoft Filtering Management Service

To register a non Microsoft IFilter you should know the class ID of the product, it can be easily located under HKEY_Classes_Root\CLSID by searching for the file extension you want o register or referring the IFilter documentation.

Description of files inside C:\Program Files\Common Files\Microsoft Shared\Filters

File Name Description
msgfilt.dll Microsoft Message IFilter
NLHTML.dll Microsoft HTML IFilter
odfflit.dll Microsoft Filter for Open Document Format
OFFFILT.dll Microsoft Office IFilter
offfiltx.dll Microsoft Office Open XML Format IFilter
ONIFILTER.dll Microsoft OneNote IFilter
PUBFLIT.dll Microsoft Publisher IFilter
VISFIT.dll Microsoft Office Visio IFilter

Have a great time until next post. Keep reading and keep exploring!  Smile

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