//How To : Add Custom Folder to My Computer or the Desktop
Create the following series of keys and values in the registry at [HKEY_CLASSES_ROOTCLSID] or [HKEY_LOCAL_MACHINESOFTWAREClassesCLSID]. The GUID, globally unique identifier, can be a random number, in this example "FD4DF9E0-E3DE-11CE-BFCF-ABCD1DE12345" is used. See this article for more GUID examples.
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How to add custom folder to Start Menu?