Providing WMI Data on a 64-bit Platform

Scripts and applications written for operating systems before Windows Server 2003 with Service Pack 1 (SP1) should continue to run properly. If you have an existing 32-bit provider, you can evaluate whether you need to write a 64-bit version for side-by-side operation. Generally, both versions are not necessary and the 64-bit version can service both 32-bit and 64-bit local or remote clients. However, for 32-bit application compatibility mode, use your existing 32-bit WMI provider on a 64-bit system that runs in the 32-bit WOW64 mode.

In rare situations, both the 32-bit and 64-bit providers must run side-by-side on 64-bit systems. In this case, the appropriate version of provider that is loaded depends on whether the caller is 32-bit or 64-bit and local or remote. A caller using the connection object context flags, __ProviderArchitecture and __RequiredArchitecture, can request that WMI load a nondefault provider. For more information, see Getting and Providing Data on a 64-bit Computer.

In the unusual case that you must run both the 32-bit and 64-bit providers side-by-side, then you must ensure that install and uninstall scenarios are handled carefully. This is because WMI has only one repository and both the 32-bit and 64-bit versions of mofcomp.exe put the data in the same repository; there is no distinction between a 32-bit or a 64-bit .mof file. Reinstalling one version of the provider will not hurt: the .mof files will be compiled and the classes stored in the repository. However, a second uninstall that deletes a namespace can interfere with the operation of the other provider.

Related topics

Getting and Providing Data on a 64-bit Computer
Requesting WMI Data on a 64-bit Platform
Providing Data to WMI

 

 

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