After removing Symantec Enterprise Vault, users receive "Invalid conversion id 64-0x0" error when viewing attachments

This article applies to the following products:
     Messageware AttachView 2003




When viewing attachments by clicking on the binocular icon, or by using the Rich or Text View in the AttachView context menu, users receive the following error

Invalid conversion id 64-0x0




This issue occurs when AttachView is installed on a front-end server from which Symantec Enterprise Vault has been removed.


When Symantec Enterprise Vault is removed, some files may be left behind including the configuration settings in IIS Manager. As a result, some of the Symantec Enterprise Vault functionality remains present when accessing Outlook Web Access.  Although this is not visible to the users in their OWA session, it can be identified in the IIS logs by applying the steps below:


1.        Login to OWA

2.        Attempt to view an attachment (the “Invalid conversion id 64-0x0” error will appear”)

3.        On the Exchange server where AttachView is installed, navigate to \windows\system32\logfiles\w3svc1

4.        Open the most current IIS log file (in the format exyymmdd.log)

5.        The following command will be present within the log file




To correct this issue, perform a manual removal of the remaining file from Symantec Enterprise Vault. We recommend contacting Symantec to perform these steps.

After a clean up of the Symantec files has been performed, continue with the steps that follow:


Execute the following command in the command prompt to ensure that the current WinHTTP proxy settings are configured to have direct access

proxycfg –d

Note: Users may experience errors when viewing attachments when the direct access is not configured for the WinHTTP proxy settings

A different parameter may be needed to configure the Bypass List, or to configure direct access to the WinHTTP proxy. Refer to the parameter list detailed in the Microsoft documentation Proxy Configuration Tool for more information.
Please refer to the link below for more information:

ProxyCfg.exe, a Proxy Configuration Tool





According to Microsoft, after using the proxy configuration tool, the original proxy settings cannot be restored; hence we strongly recommend making a backup of the registry. Please refer to the link below for more information:

WinHTTP AutoProxy Support  



This article applies to the following products:
     Messageware AttachView 2003