blocking programs from start menu's most frequntly used list

1. Add the NoStartPage entry to the application's registration as shown here: 
 
HKEY_CLASSES_ROOT
     Applications
          Example.exe
               NoStartPage 
 
The data associated with the NoStartPage entry is ignored. Only the  presence of the entry is required. Therefore, the ideal type for  NoStartPage is REG_NONE .
 
Note: Any use of an explicit AppUserModelID overrides  the NoStartPage entry. If an explicit AppUserModelID is applied to a  shortcut, process, or window, it becomes pinnable and eligible for the Start menu MFU list.
  
 2. Set the System.AppUserModel.PreventPinning property on windows and shortcuts. This property must be set on a window before the PKEY_AppUserModel_ID property. 
  
 3. Add an explicit AppUserModelID as a value under the following registry subkey as shown here: 
 
HKEY_LOCAL_MACHINE
     Software
          Microsoft
               Windows
                    CurrentVersion
                         Explorer
                              FileAssociation
                                   NoStartPageAppUserModelIDs
                                        AppUserModelID1
                                        AppUserModelID2
                                        AppUserModelID3
 
Each  entry is a REG_NULL value with the name of the AppUserModelID. Any  AppUserModelID found in this list is not pinnable and not eligible for  inclusion in the Start menu MFU list.