Hiding files, directories, or even to the names of the files themselves. A useful CLSID is the Control Panel one: {21EC2020-3AEA-1069-A2DD-08002B30309D}.

Example 1:

- Create a text file test.txt
- Rename it: Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}

Its icon changes and looks like the real Control Panel. If you
double-click on it, the Control Panel opens. But you can easily edit it
with Notepad, providing its full path.

Example 2: to hide several files in one operation

- Create a directory "testdir" (without the quotes)
- Create some files in this directory
- Rename the directory: Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}

Once again, its icon changes and looks like the real Control Panel. If
you double-click on it, the Control Panel opens. The files inside the
directory are invisible.
To edit them, you can either rename the directory back to testdir
(but Windows Explorer can't do it) or access the files directly by their
full path.

Note that a search to find the files fails !

u can also use...
.{00020D75-0000-0000-C000-000000000046} - Inbox
.{00028B20-0000-0000-C000-000000000046} - Microsoft Network
.{1A9BA3A0-143A-11CF-8350-444553540000} - Favorites Folder
.{208D2C60-3AEA-1069-A2D7-08002B30309D} - Network Neighborhood
.{20D04FE0-3AEA-1069-A2D8-08002B30309D} - My Computer
.{21EC2020-3AEA-1069-A2DD-08002B30309D} - Control Panel
.{2227A280-3AEA-1069-A2DE-08002B30309D} - Printers
.{3DC7A020-0ACD-11CF-AB99-00AA004AE837} - Internet Explorer 5
.{450D8FBA-AD25-11D0-98A8-0800361B1103} - My Documents
.{63da6ec0-2e98-11cf-8d82-444553540000} - Microsoft FTP Folder (Internet Explorer FTP to look like explorer)
.{645FF040-5081-101B-9F08-00AA002F954E} - Recycle Bin
.{7BD29E00-76C1-11CF-9DD0-00A0C9034933} - Temperary Internet Files
.{85BBD920-42A0-1069-A2E4-08002B30309D} - Briefcase
.{88C6C381-2E85-11D0-94DE-444553540000} - ActiveX Chache Folder
.{992CFFA0-F557-101A-88EC-00DD010CCC48} - Dial-Up Network
.{BD84B380-8CA2-1069-AB1D-08000948F534} - Fonts Folder
.{BDEADF00-C265-11d0-BCED-00A0C90AB50F} - Web Folders
.{D6277990-4C6A-11CF-8D87-00AA0060F5BF} - Scheduled Tasks
.{F5175861-2688-11d0-9C5E-00AA00A45957} - Subscription Folder
.{FBF23B42-E3F0-101B-8488-00AA003E56F8} - Internet Explorer
.{FF393560-C2A7-11CF-BFF4-444553540000} - History