Why does the portable device ignore the value of the "FileSyncPath" registry key?

Question

Why does the portable device ignore the value of the "FileSyncPath" registry key?

We do not want to synchronize files between our handheld device and a PC.

The portable device places certain (SQL CE databases) files in the \ My Documents folder on the handheld computer. These are, in particular, files that we do not want to synchronize with a PC.

I first added "sdf" (and "SDF" to be sure) to the "ExcludeExts" registry key. It did not help. Then I changed the registry keys "FileSyncPath" and "NoSubfolderIn" from the "My Documents" folder to the "profiles" folder:

private void UpdateRegistry()
{
    RegistryKey key =
Registry.LocalMachine.CreateSubKey(@"SOFTWARE\Microsoft\Windows CE
Services");
    if (key != null)
    {
        key.SetValue("ExcludeExts", "lnk,tmp,cdb,mdb,sdf,SDF", 
RegistryValueKind.String);
        key.SetValue("FileSyncPath", "\\profiles",
RegistryValueKind.String);
        key.SetValue("NoSubfolderIn", "\\profiles\\",
RegistryValueKind.String);
    }
}

There is nothing in the profiles folder except another folder that should be ignored due to the "NoSubfolderIn" registry key:

enter image description here

Changes were written to the registry on the device:

enter image description here

... .SDF \My Documents, :

enter image description here

? , .SDF , (IOW, " " , , -, , )? Windows CE Services? , , "Windows CE Tools":

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows CE Services <= It has one registry key, "DeviceFriendlyName"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows CE Services <= shown in the scream shot above; it has several (7) registry keys
HKEY_LOCAL_MACHINE\Windows CE Tools <= It has one registry key, "Platform"
HKEY_LOCAL_MACHINE\Windows CE Services <= it empty

""? - ?

UPDATE

, , " Windows CE":

RegistryKey keyLocalWCES =
    Registry.LocalMachine.CreateSubKey(@"Windows CE Services");
if (null != keyLocalWCES)
{
    keyLocalWCES.SetValue("GuestOnly", 00000001
RegistryValueKind.DWord);
    keyLocalWCES.SetValue("ExcludeExts", "lnk,tmp,cdb,mdb,sdf,SDF"
RegistryValueKind.String);
    keyLocalWCES.SetValue("FileSyncPath", "\\profiles",
RegistryValueKind.String);
    keyLocalWCES.SetValue("NoSubfolderIn", "\\profiles\\",
RegistryValueKind.String);
}

RegistryKey keyCurrentUser 
    Registry.CurrentUser.CreateSubKey(@"SOFTWARE\Microsoft\Windows CE 
        Services");
if (null != keyCurrentUser)
{
    keyCurrentUser.SetValue("GuestOnly", 00000001
RegistryValueKind.DWord);
    keyCurrentUser.SetValue("ExcludeExts"
"lnk,tmp,cdb,mdb,sdf,SDF", RegistryValueKind.String);
    keyCurrentUser.SetValue("FileSyncPath", "\\profiles",
RegistryValueKind.String);
    keyCurrentUser.SetValue("NoSubfolderIn", "\\profiles\\",
RegistryValueKind.String);
}