Microsoft Office Outlook with Avast 4 Problem

Asked By 200 points N/A Posted on -


I am installing Avast Antivirus 4.08 edition with operating system Windows.

I started to setup Microsoft Outlook from Office 2007.

I found a message telling me :

The Add-in “avast!4” (C:Program FilesAlwil
SoftwareAvast4ashOutXt.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.

I went to Avast trust center to search about the disabled Add-in, but I didn’t find any disabled Add-in.

Also,I went to the COM Add-in, but there is no any disabled Add-in.

I searched about this error in most of the forums, but I didn’t find any solution.

So, if you please tell me how to get rid of this message and use the MS Outlook normally,it will be helpful.


Best Answer by LJohn
Best Answer
Best Answer
Answered By 0 points N/A #126916

Microsoft Office Outlook with Avast 4 Problem



I have also experienced this  problem before, but I was able to fix it somehow. The cause of this problem is actually the file named "extend.dat". This file is a cache that Outlook builds from the registry information, so that it doesn't have to check and read all of the settings from the registry every time it starts. Deleting this file will cause Outlook to remake or recreate it, taking into account the changes Avast! Setup made to the appropriate reg: keys.
Before you proceed to the solution you might want to Restart you computer just to make sure that no unuseful Programs running. etc.
Search your entire System drive for a file named "extend.dat" and rename it or just simply delete it. You have to find all instances of "extend.dat" of all users who uses OS/Outlook and delete it also. this file is actually inside a hidden folder, so if you are using windows search function, you need to enable searching of hidden/system files.
Then after that you have to open Windows Registry, navigate to the following registry key:
This is where you have to delete registry value named "avast! 4" which contains path to the file "ashOutXt.dll" in value data.
(by the way, you can open windows registry by simply doing this -go to start menu, – Open RUN, – type regedit).
That's all. I hope that helps.
Answered By 0 points N/A #195664

Microsoft Office Outlook with Avast 4 Problem


Hi John

Deleting the extend.dat file can solve this because Avast 5 doesn't include anti spam filter module that's why your encountering this error.

To locate this file go to:

  1. My computer
  2. C:/local disk (C)
  3. Documents and settings
  4. Your username
  5. Local settings
  6. Application data
  7. Microsoft
  8. Outlook

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