This article was previously published under Q197298
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This article provides information about the contents of the Microsoft Libraries Update and where you can obtain it.
The Microsoft Libraries Update addresses known binary compatibilityproblems with certain run-time redistributable files shipped with VisualStudio 6.0 built applications.
This update is for customers who do not have any Visual Studio 6.0 products installed on their computer but have installed applications that include 6.0 libraries. This update will correct problems in the 6.0 libraries but will not modify or replace earlier libraries.
Customers who have installed any Visual Studio 6.0 products such as Visual Basic 6.0 or Visual C++ 6.0 should install the latest Microsoft Visual Studio Service pack, as documented in the following article in the Microsoft Knowledge Base:
194022 INFO: Microsoft Visual Studio Service Packs, What, Where, Why
This Microsoft Libraries Update is localized into eight languages: German,Japanese, French, Italian, Spanish, Korean, Chinese (Simple), and Chinese(Traditional).
NOTE: The Windows Library Updates require a reboot.
The following list contains all of the files that will be included in theMicrosoft Libraries Update.
Filename Version Description-----------------------------------------------------------------------Msvcrt.dll 6.00.8337 Visual C++ run-time, no dependencies.Oleaut32.dll 2.30.4265 Part of the OLE-AUT fileset that complements Microsoft Foundation Classes (MFC) and Visual Basic run-time.Olepro32.dll 5.00.4265 Part of OLE-AUT fileset that complements MFC and Visual Basic run-time.Asycfilt.dll 2.30.4265 Part of OLE-AUT fileset that complements MFC and Visual Basic run-time.Stdole2.tlb 2.30.4265 Part of OLE-AUT fileset that complements MFC and Visual Basic run-time.Mfc42.dll 6.00.8267 Microsoft Foundation Class (MFC), dependent on Msvcrt.dll, ComCtl32.dll, and OLE-AUT files.Mfc42u.dll 6.00.8267 MFC Unicode only for the Windows NT Platform.Regsvr32.exe For registration purposes only. For Mfc42.dll and Oleaut32.dll.RegTlib.exe For .tlb registration for stdole2.tlb.
What Does This Update Fix?
This update has the new C-Run-time Library DLL, Msvcrt.dll. which resolvesthe heap compatibility problems described in the following MicrosoftKnowledge base articles:
194550 PRB: Freeing Memory Multiple Times May Cause an Access Violation
The cause of the compatibility problems was a change in the internal layoutof the way that the C Run-Time library allocates memory. No applicationshould be dependant on this layout, but due to the issues in the previouslymentioned articles, they are unknowingly affected by the new heap manager.The new Msvcrt.dll file implements two heap managers, the Visual C++ 5compatible heap manager and the Visual C++ 6 compatible heap manager. Itdetects with which Visual C++ version your application is built and usesthe appropriate heap manager for that application. If this version is 6.0or greater, the Visual C++ 6 compatible heap manager is used and if it isearlier than version 6.0,the Visual C++ 5 compatible heap is used.
The following bugs in Visual C++ 6.0 are also fixed in this update:
193099 FIX: CDialog::Create() Returns Incorrect Value Calling EndDialog