https://learn.microsoft.com/it-it/dotnet/api/system.windows.shell.jumpitem.customcategory?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-9.0
JumpItem.CustomCategory Property (System.Windows.Shell) | Microsoft Learn
Gets or sets the name of the category the JumpItem is grouped with in the Windows 7 taskbar Jump List.
property systemwindowsshellmicrosoftlearn