XCLN: An Extension Failed To Initialize

• Microsoft Windows 95 client, version 5.0
• Microsoft Exchange Windows NT client, version 5.0

SYMPTOMS

When you attempt to start the Microsoft Exchange Client, you may receive the following error message:

   An extension failed to initialize. The entry point could not be
   obtained.

CAUSE

The name or path of the DLL where the custom command resides is incorrect. This entry can optionally be followed by a comma and the ordinal of the entry point to call (default is 1).

WORKAROUND

Using the Registry Editor, ensure that the path statement in the dialog box correctly points to the DLL in question and that the original is correct. In the CleanSweep utility (Clnsp32.dll) located in the Back Office Resource Kit the ordinal is 2.

Example: Winnt4.0; c:\windows\system32\clnswp32.dll;2

This is assuming your OS is installed in C:\Windows and the DLL is in the System32 subdirectory.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

To repair the problem, perform the following steps:

1. At the command prompt, type RegEdit.

2. In the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Client \Extensions registry key, add the following New String value: Clnswp

3. Note that the Data value for this String value should be as follows:

   4.0;c:\windows\system32\clnswp32.dll;2