KB201364 - PRB: Mismatched Ole32.dll and Comcat.dll

Article ID: 201364

Article Last Modified on 1/12/2005

APPLIES TO

Microsoft Windows NT Server 4.0 Standard Edition
Microsoft Windows NT Workstation 4.0 Developer Edition

This article was previously published under Q201364

SYMPTOMS

All the following symptoms apply:

When you perform the following steps

RegSvr32.Exe <Path for Windows\System>\ComCat.DLL on Windows 95.
RegSvr32.Exe <Path for Winnt\System32>\ComCat.DLL on NT 4.0.
Run the Setup program created with Microsoft Visual Basic. this error message appears:
Comcat.dll was loaded, but the DllRegisterServer was entry point not found. DllRegisterServer may not be exported, or a corrupt version may be in memory. Consider using Pview to detect and remove it.

If you click Components from the Project menu in Visual Basic 5.0 or 6.0 to display the Components dialog box, the following error message appears:

Class not registered Looking for object with CLSID: { 000E200]005-0000-0000-C000-000000000046 }

-or-

System Error &H80004002 (-2147467262). No such interface supported.

If you click OK, the Components dialog box appears, but the components list may be empty.

Internet Explorer 4.0 or later gives the warning
This page provides potentially unsafe information to an ActiveX Control. Your current security settings prohibit running controls in this manner. As a result, this page may not display correctly.
while you access the Web site
http://msdn.microsoft.com/workshop/samples/author/databind/eltdyn.htm
instead of displaying a table of chemical elements.

CAUSE

These symptoms are caused by mismatched Ole32.dll and Comcat.dll files on the system.

Comcat.dll version 4.71 exports the following functions:

DllRegisterServer
DllGetClassObject
DllUnRegisterServer
DllCanUnloadNow

Comcat.dll version 5.0 exports the following functions:

DllCanUnloadNow
DllUnRegisterServer

DllGetclassObject and DllRegisterServer are forwarded to Ole32.dll.

Comcat.dll version 5.0 works with Ole32.dll version 4.71 and later. Comcat.dll version 4.71 works with Ole32.dll version 4.0.

RESOLUTION

To resolve this problem, copy Comcat.dll version 4.71 into the System or System32 folder and register it.

MORE INFORMATION

Comcat.dll version 4.71 is distributable through Msvbvm50.exe. For additional information about Msvbvm50.exe, click the article number below to view the article in the Microsoft Knowledge Base:

180071 FILE: Msvbvm50.exe Installs Visual Basic 5.0 Run-Time Files

Please note that Comcat.dll version 5.0 is not redistributable.

REFERENCES

For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

177943 ActiveX Errors Running Microsoft Internet Explorer

175156 PRB: Class Not Registered Error and Empty Components Dialog

To learn what products include version 5.0 of Comcat.dll, use the Microsoft DLL Help Database.

Keywords: kbprb KB201364