FIX: An application that uses the Mfc80.dll module or the Mfc80u.dll module crashes after you install a product that updates the module version


You install a product that updates the Mfc80.dll module or the Mfc80u.dll module on the computer from version 8.0.50727.870 to version 8.0.50727.3078. For example, you install Microsoft SQL Server 2008. When you run an application that is built with Microsoft Visual Studio 2005, an access violation occurs in the Mfc80.dll module or in the Mfc80u.dll module. And, the application crashes.

Note This problem applies to many other applications, including applications that are used on Windows 7.


This problem occurs because the two versions are incompatible.


Resolution for computers that do not have Visual Studio 2005 installed

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

To download this hotfix from the MSDN Code Gallery, visit the following Microsoft website:

Note The MSDN Code Gallery displays the languages for which the hotfix is available. If you do not see your language listed, it is because the Code Gallery resource page is not available for that language.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:
Note For x86-based versions of Windows, select the packages ending with "_x86." For x64-based versions of Windows, select the packages ending with "_x64" for 64-bit applications and the packages ending with "_x86" for 32-bit applications. Additionally, select the appropriate localization based on the following key:
  • CHSSimplified Chinese
  • CHTTraditional Chinese
  • ENUEnglish
  • FRAFrench
  • GERGerman
  • ITAItalian
  • JPNJapanese
  • KORKorean
  • SPASpanish


There are no prerequisites.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the
Time Zone
tab in the
Date and Time
item in Control Panel.

File nameFile versionFile sizeDateTimePlatform
Atl80.dll8.0.50727.307996,25624-Oct- 200818:31x86
Atl80.dll8.0.50727.3079114,68824-Oct- 200819:07x86
Atl80.dll8.0.50727.307996,25624-Oct- 200819:07x86
Atl80.dll8.0.50727.3079113,15224-Oct- 200819:18x64
Atl80.dll8.0.50727.3079113,15224-Oct- 200823:30x64
Mfc80.dll8.0.50727.30791,658,88024-Oct- 200819:53x64
Mfc80.dll8.0.50727.30791,105,92024-Oct- 200820:30x86
Mfc80.dll8.0.50727.30791,105,92024-Oct- 200820:30x86
Mfc80.dll8.0.50727.30791,658,88024-Oct- 200823:30x64
Mfc80chs.dll8.0.50727.307933,28024-Oct- 200819:54x64
Mfc80chs.dll8.0.50727.307940,96024-Oct- 200820:12x86
Mfc80chs.dll8.0.50727.307940,96024-Oct- 200820:30x86
Mfc80chs.dll8.0.50727.307933,28024-Oct- 200823:30x64
Mfc80cht.dll8.0.50727.307933,79224-Oct- 200819:54x64
Mfc80cht.dll8.0.50727.307945,05624-Oct- 200820:12x86
Mfc80cht.dll8.0.50727.307945,05624-Oct- 200820:30x86
Mfc80cht.dll8.0.50727.307933,79224-Oct- 200823:30x64
Mfc80deu.dll8.0.50727.307954,27224-Oct- 200819:54x64
Mfc80deu.dll8.0.50727.307965,53624-Oct- 200820:12x86
Mfc80deu.dll8.0.50727.307965,53624-Oct- 200820:30x86
Mfc80deu.dll8.0.50727.307954,27224-Oct- 200823:30x64
Mfc80enu.dll8.0.50727.307947,10424-Oct- 200819:54x64
Mfc80enu.dll8.0.50727.307957,34424-Oct- 200820:12x86
Mfc80enu.dll8.0.50727.307957,34424-Oct- 200820:30x86
Mfc80enu.dll8.0.50727.307947,10424-Oct- 200823:30x64
Mfc80esp.dll8.0.50727.307951,71224-Oct- 200819:54x64
Mfc80esp.dll8.0.50727.307961,44024-Oct- 200820:12x86
Mfc80esp.dll8.0.50727.307961,44024-Oct- 200820:30x86
Mfc80esp.dll8.0.50727.307951,71224-Oct- 200823:30x64
Mfc80fra.dll8.0.50727.307952,73624-Oct- 200819:54x64
Mfc80fra.dll8.0.50727.307961,44024-Oct- 200820:12x86
Mfc80fra.dll8.0.50727.307961,44024-Oct- 200820:30x86
Mfc80fra.dll8.0.50727.307952,73624-Oct- 200823:30x64
Mfc80ita.dll8.0.50727.307952,22424-Oct- 200819:54x64
Mfc80ita.dll8.0.50727.307961,44024-Oct- 200820:12x86
Mfc80ita.dll8.0.50727.307961,44024-Oct- 200820:30x86
Mfc80ita.dll8.0.50727.307952,22424-Oct- 200823:30x64
Mfc80jpn.dll8.0.50727.307938,91224-Oct- 200819:54x64
Mfc80jpn.dll8.0.50727.307949,15224-Oct- 200820:12x86
Mfc80jpn.dll8.0.50727.307949,15224-Oct- 200820:30x86
Mfc80jpn.dll8.0.50727.307938,91224-Oct- 200823:30x64
Mfc80kor.dll8.0.50727.307938,40024-Oct- 200819:54x64
Mfc80kor.dll8.0.50727.307949,15224-Oct- 200820:12x86
Mfc80kor.dll8.0.50727.307949,15224-Oct- 200820:30x86
Mfc80kor.dll8.0.50727.307938,40024-Oct- 200823:30x64
Mfc80u.dll8.0.50727.30791,655,29624-Oct- 200819:54x64
Mfc80u.dll8.0.50727.30791,093,12024-Oct- 200820:30x86
Mfc80u.dll8.0.50727.30791,093,12024-Oct- 200820:30x86
Mfc80u.dll8.0.50727.30791,655,29624-Oct- 200823:30x64
Mfcm80.dll8.0.50727.307965,02424-Oct- 200819:55x64
Mfcm80.dll8.0.50727.307969,63224-Oct- 200820:30x86
Mfcm80.dll8.0.50727.307965,02425-Oct- 200802:11x64
Mfcm80.dll8.0.50727.307969,63225-Oct- 200802:12x86
Mfcm80u.dll8.0.50727.307963,48824-Oct- 200819:55x64
Mfcm80u.dll8.0.50727.307957,85624-Oct- 200820:30x86
Mfcm80u.dll8.0.50727.307957,85625-Oct- 200802:11x86
Mfcm80u.dll8.0.50727.307963,48825-Oct- 200802:11x64
Msvcm80.dll8.0.50727.3079479,23224-Oct- 200819:06x86
Msvcm80.dll8.0.50727.3079515,07224-Oct- 200819:16x64
Msvcm80.dll8.0.50727.3079479,23225-Oct- 200802:11x86
Msvcm80.dll8.0.50727.3079515,07225-Oct- 200802:11x64
Msvcr80.dll8.0.50727.3079803,65625-Oct- 200801:21x64
Msvcr80.dll8.0.50727.3079633,67225-Oct- 200801:27x86
Msvcr80.dll8.0.50727.3079803,65625-Oct- 200802:11x64
Msvcr80.dll8.0.50727.3079633,67225-Oct- 200802:11x86
Vcomp.dll8.0.50727.307987,55224-Oct- 200819:58x64
Vcomp.dll8.0.50727.307965,53624-Oct- 200820:42x86
Vcomp.dll8.0.50727.307965,53624-Oct- 200820:42x86
Vcomp.dll8.0.50727.307987,55224-Oct- 200823:30x64

Resolution for computers that have Visual Studio 2005 installed

To resolve this problem on a computer that has Visual Studio 2005 installed, apply the hotfix that is described in KB 958036.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.