![]() The hierarchical registry structure for file and protocol associations gives precedence to per-user defaults over machine-level defaults. Instead, defaults must be registered on a per-user level, which prevents multiple users from overwriting each other's defaults. However, attempts by an application to modify default association behaviors at a machine level post-installation will be unsuccessful. Installation of a program by a user is typically performed as an elevated process. This restriction is a security feature that prevents a process from acting as an administrator without the administrator's knowledge. ![]() Under UAC, an administrator appears to the system as a standard user, so that administrator cannot typically write to the HKEY_LOCAL_MACHINE subtree. Use of the associated API set can help an application function correctly under the user account control (UAC) feature introduced in Windows Vista. For example, a digitally signed application can include a URL to the manufacturer's home page. Launch a UI for a specific application where a user can set individual defaults.ĭefault Programs also provides a UI that enables you to register an application in order to provide additional information to the user.You can query for the default of a file association, protocol, or Start menu canonical verb. Query for the owner of a specific default in a single call instead of searching the registry.Restore a single registered default for an application.Restore all registered defaults for an application.Applications that use their own proprietary protocols and file associations do not typically use the Default Programs functionality.Īfter you register an application for Default Programs functionality, the following options and functionality are available by using the API set: ![]() jpg files or standard protocols, such as HTTP or mailto. Introduction to Default Programs and Its Related API Setĭefault Programs is primarily designed for applications that use standard file types such as.
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