OpenSubKey() Requested registry access is not allowed

[Judith Schmidt]

Hi group,

i search a way to change permissions of a registry key, where only the
system account have got full rights.
It is not stupid to think that this is possible because i am the owner
(administrator) of the key and it is possible to change it with
regedit32.exe.

The following code fails on OpenSubKey() with
System.Security .SecurityExcept ion: Requested registry access is not allowed

// ----start----
SetPermissions( ){
String^ user = Environment::Us erDomainName + "\\testuser ";
RegistryKey^ openedKey;
RegistrySecurit y regSecurity = gcnew RegistrySecurit y();
regSecurity->AddAccessRule( gcnew RegistryAccessR ule(user,
RegistryRights: :ReadKey,
InheritanceFlag s::ContainerInh erit | InheritanceFlag s::ObjectInheri t,
PropagationFlag s::InheritOnly,
AccessControlTy pe::Allow));
regSecurity->SetAccessRuleP rotection(false ,true);
openedKey =
Registry::Users->OpenSubKey(" S-1-5-18\\software\\t estkey",true);
openedKey->SetAccessContr ol(regSecurity) ;
return 0;
}
// ----end----