RegDword compares a registry value to a certain number. RegValueExists checks whether a certain registry type and/or value exists for a specified registry key.

RegKeyExists checks whether the specified registry key exists.

For more information on these methods, see BaseApplicabilityRules Schema. The following are some examples of registry-based detection methods (from BaseApplicabilityRules.xsd). For example, a registry key may not be removed when the application is removed, or it may not be updated when a new version is installed.Īll registry keys used by detection methods must be written under HKEY_LOCAL_MACHINE. However, there is no way to guarantee that the state of the registry corresponds to the state of the product or update. Registry-based detection methods are easy to use. WindowsDriver.xsd defines the applicability rules used by Windows drivers. MsiApplicabilityRules.xsd defines the applicability rules used by Windows Installer files. LogicalApplicabilityRules.xsd defines the logical operators (And, Or, Not, True, and False) that allow more complex expressions to be built from the basic rules. Applicability rule schemasĭetection methods are defined by one or more of the following schemas:īaseApplicabilityRules.xsd defines the basic applicability rules, including checks for specific Windows versions and file or registry key existence. The most available detection methods are those that query the system registry or file system. Different detection tools expose different detection methods. Applies To: Windows Server Update Servicesĭetection methods are the different methods defined in the update schemas for use in the applicability rules.

Winscan windows version detection