To determine whether you can use OpenGL hardware acceleration, use the DescribePixelFormat function. Examine the pixelformatdescriptor data structure that the function returns. If the PFD_GENERIC_ACCELERATED flag is clear and if the PFD_GENERIC_FORMAT flag is set, Windows on Windows 64 will use software emulation to emulate hardware acceleration.
For more information about the DescribePixelFormat function, visit the following Microsoft MSDN Web site:
Microsoft Windows on Windows 64 is a 32-bit Windows subsystem that allows you to run 32-bit programs on 64-bit versions of Windows. The current implementation of Windows on Windows 64 uses software emulation to emulate OpenGL acceleration. This process affects how 32-bit programs run, and performance may not meet your expectations. Additionally, you may experience unexpected behavior when you run 32-bit programs on 64-bit versions of Windows.
Hotfix InformationA 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.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
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 Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
PrerequisitesNo prerequisites are required.
Restart requirementYou do not have to restart your computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any other hotfixes.
File informationThe English version of this hotfix has the file attributes (or later) 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 tool in Control Panel.
Date Time Version Size File name Platform
04-Feb-2004 22:04 5.2.3790.125 380,928 Glu32.dll IA-64
04-Feb-2004 22:04 5.2.3790.125 27,136 Mcd32.dll IA-64
04-Feb-2004 22:04 5.2.3790.125 2,027,520 Opengl32.dll IA-64
04-Feb-2004 22:08 5.2.3790.125 118,272 Wglu32.dll x86
04-Feb-2004 22:08 5.2.3790.125 11,264 Wmcd32.dll x86
04-Feb-2004 22:08 5.2.3790.125 685,056 Wopengl32.dll x86
Article ID: 835563 - Last Review: Mar 29, 2017 - Revision: 3