Error message when an application calls the RegisterTypeLib API to register a type library in Windows Vista: "Access denied"

Consider the following scenario. In an application that is running on a Windows Vista-based computer, you try to map the registry subtree to another registry subtree. For example, you try to map the registry subtree to the registry subtree. When the application calls the RegisterTypeLib API to register a type library, you may receive the following error message: Additionally, the RegisterTypeLib API returns the TYPE_E_REGISTRYACCESS (0x8002801c) value.

This problem occurs if User Account Control (UAC) is enabled, and the application is running under the Limited User Account.

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix information

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.

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.After you install this hotfix, you must enable the hotfix. See the "Enable the hotfix" section for more information.

Prerequisites

You must have Windows Vista installed to apply this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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.

Windows Vista, x86-based versions

Windows Vista, 64-bit versions

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

Enable the hotfix

After you install this hotfix, you must use one of the following methods to enable the hotfix.

Method 1

This hotfix adds a new API. Before the application calls the RegisterTypeLib API, the application can call the void OaEnablePerUserTLibRegistration function to enable the RegisterTypeLIb API to use the appropriate override mapping. The OaEnablePerUserTLibRegistration function is exported from the Oleaut32.dll file. You must reference this file by using Run-Time Dynamic Linking and by using the GetProcAddress function. For more information about the GetProcAddress function and about Run-Time Dynamic Linking, visit the following Microsoft Web site:

Method 2

After you install the hotfix, the RegisterTypeLib API will check the OAPERUSERTLIBREG environment variable. If the value of the OAPERUSERTLIBREG variable is 1, the RegisterTypeLIb API will use the appropriate override mapping. Because this environment variable is read during the initialization of the DLLMain function, you must set this environment variable before you run the application. To do this, run one of the following commands at a command prompt:

• set OAPERUSERTLIBREG=1
• start cmd.exe /c "set OAPERUSERTLIBREG=1 && MyApp.exe"
  
  Note The MyApp.exe placeholder points to the application that you want to run.

Note The first command only sets the environment variable. The second command sets the environment variable and then runs the application. If you use the first command, you must also run the application at this command prompt.

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

For more information about the registry subtree, visit the following Microsoft Web site: For more information about the RegisterTypeLib API, visit the following Microsoft Web site: