The Add-in "Outlook Scan" (...\Scanotlk.dll) cannot be loaded and has been disabled by Outlook

by Gabriel Lozano-Moran 3. December 2007 12:43

Yesterday I uninstalled McAfee VirusScan Enterprise v8.5.1 from my development sandbox and each time I open Microsoft Outlook 2007 I receive the following dialog:

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Microsoft Office Outlook
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The Add-in "Outlook Scan" (C:\Program Files\McAfee\VirusScan Enterprise\Scanotlk.dll) cannot be loaded and has been disabled by Outlook. Please contact the Add-in manufacturer for an update. If no update is available, please uninstall the Add-in.
---------------------------
OK  
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image

How to solve this?

Delete EXTEND.DAT from the folder %userprofile%\Local Settings\Application Data\Microsoft\Outlook and start Microsoft Outlook 2007.

 

What the heck is EXTEND.DAT?

Extensions register themselves in the registry and Outlook reads the registry information only once for an extension. For performance reasons, Outlook transfers this registry info to an internal cache EXTEND.DAT. Outlook uses the EXTEND.DAT file to record paths to DLLs for all extensions loaded into Outlook. The first time you begin an Outlook session, or any time after an extension is installed, uninstalled, or upgraded, EXTEND.DAT will be rewritten with the new DLL paths.

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Comments

1/28/2008 8:35:15 PM #

worked perfect!! thanks.

Frank Coloccia | Reply

3/1/2008 6:45:55 AM #

Thankssss!! That worked

JayDee | Reply

4/21/2008 3:11:20 AM #

yep it works....
thanks all

Lue | Reply

5/22/2008 5:18:42 PM #

Thanks MAN Smile

Great work.......

Shamseer P Hamsa | Reply

6/12/2008 10:22:07 PM #

I added the Scanotlk.dll on CTongrogram files \Mcfee\Virus Scanenterprise \paste the Scanotlk.dll . Then closed outllok and open it .

Mandi | Reply

7/18/2008 11:22:02 PM #

thanks it worksvery firmlyeven outlook 2007

seungjun | Reply

8/12/2008 2:12:34 PM #

Thanks, big help. Another happy customer.

Nick | Reply

9/4/2008 9:32:11 PM #

Great thanks.
Just for ref. In Vista the path is .

C:\Users\%UserProfile%\AppData\Local\Microsoft\Outlook

VOIPMoney | Reply

10/24/2008 3:04:59 PM #

Thanks, this helped me a looooot...

Kashif | Reply

11/26/2008 6:02:20 PM #

Spot on, good shooting!

Rob Mathewson | Reply

1/29/2009 11:42:01 AM #

and then.... it worked... awesome!!

worked | Reply

2/11/2009 1:37:09 PM #

Thanks a lot

your provided solution worked for me.


The Add-in "Outlook Scan" (...\Scanotlk.dll) cannot be loaded and has been disabled by Outlook
The Problem


How to solve this?

Delete the file EXTEND.DAT from the folder %userprofile%\Local Settings\Application Data\Microsoft\Outlook\ and start Microsoft Outlook 2007.

Amuual | Reply

2/13/2009 5:19:54 AM #

Works like a charm.....Thanks

Zoski | Reply

2/26/2009 5:06:48 PM #

What should I do if Extend.dat does not exist?

Thank you!

Brandon | Reply

3/12/2009 6:24:48 PM #

It's a hot tip. Thanx.

Helios | Reply

3/23/2009 1:06:58 PM #

Hei thanks yar,Since becoz i resolved the same issue with ur sollution...

Saravanan.S | Reply

4/16/2009 9:29:13 PM #

Thanks Great Work on this.  How lame.

Chris Hughes | Reply

5/1/2009 6:17:23 PM #

Werkt perfect. bedankt !!

Hans | Reply

7/23/2009 11:46:46 PM #

the path is actually C:\Documents and Settings\dflack\Local Settings\Application Data\Microsoft\Outlook
%appdata% takes you to a different folder.  But thanks for the writeup, would never have found it without your help.

Adam | Reply

7/31/2009 11:11:07 AM #

Great!!! It's worked.... Thanks a lot.....

Top | Reply

12/4/2009 12:06:09 PM #

This is a perfect knowledge base, well done!

Work perfectly.

Ravinder United Kingdom | Reply

12/10/2009 1:23:36 PM #

Thanks to all, you are the best.

serge France | Reply

1/4/2010 6:27:27 PM #

Great, this works fine.  Thanks a lot!!!

Joe Guderi United States | Reply

1/19/2010 3:56:15 AM #

True to form, it works!  Gracias!

Doogaloo United States | Reply

1/30/2010 4:02:23 PM #

This works great ! Absolutely fantastic resolution. Much appreciated !

Vijay Singh India | Reply

2/16/2010 6:33:42 PM #

Worked like a charm, thanks!

Neil United States | Reply

2/19/2010 2:42:33 PM #

thanks

stokesie United Kingdom | Reply

2/23/2010 9:24:27 AM #

Hi,

I have a small query regarding microsoft outlook archive file...

Q: Im using microsoft outlook 2007 im my office desktop & i have archived file of approx. 500MB. Can i open these archived data file in my laptop or on some other PC

thanks in advance

cute.engg India | Reply

3/9/2010 1:40:14 AM #

Hello, I have browsed most of your posts. This page is probably where I got the most useful information for my information gathering. Thanks for posting, maybe we can see more on this. I also like this layout can you tell me where to get it  

mortgage loan modification United States | Reply

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About me

Hello, my name is Gabriel Lozano-Moran. I am a .NET developer living in Belgium.

On this blog you will read about my daily struggles, adventures, failures and triumphs in the wonderful and exciting world of .NET development.