![]() They also point out cases where multiple explicit AppUserModelIDs should be used.Ī single executable file with a UI with multiple modes that appear to the user as separate applications should assign different AppUserModelIDs to each mode. The following items describe common scenarios that require an explicit AppUserModelID. If those methods are called from another process, such as an installer or uninstaller, the system cannot generate the correct AppUserModelID and those calls will have no effect. If applications do not have an explicit AppUserModelID, they must call IApplicationDestinations, IApplicationDocumentLists, and ICustomDestinationList methods as well as SHAddToRecentDocs from within the application. It must also use that AppUserModelID when customizing its Jump List through ICustomDestinationList, and in any calls to SHAddToRecentDocs. If an application uses an explicit AppUserModelID, it must also assign the same AppUserModelID to all running windows or processes, shortcuts, and file associations. Applications cannot retrieve a system-assigned AppUserModelID. Therefore, it is strongly recommended that an explicit ID be set. However, there is a performance benefit in avoiding those calculations and an explicit AppUserModelID is the only way to guarantee an exact user experience. In that case, the system uses a series of heuristics to assign an internal AppUserModelID. ![]() Some applications do not declare an explicit AppUserModelID. Exclusion Lists for Taskbar Pinning and Recent/Frequent ListsĪpplication-Defined and System-Defined AppUserModelIDs. ![]() Registering an Application as a Host Process.How to Form an Application-Defined AppUserModelID.Application-Defined and System-Defined AppUserModelIDs.However, an application that owns multiple processes or an application that is running in a host process might need to explicitly identify itself so that it can group its otherwise disparate windows under a single taskbar button and control the contents of that application's Jump List. ![]() In some cases, it is sufficient to rely on the internal AppUserModelID assigned to a process by the system. Application User Model IDs (AppUserModelIDs) are used extensively by the taskbar in Windows 7 and later systems to associate processes, files, and windows with a particular application. ![]()
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