C# - File Assocation Access to the registry key 'HKEY_CLASSES_ROOT\' is denied

I currently have a program that sets file association using the registry (Note, it's a .NET 2.0 so I have to go through the registry method). The problem is, since it's trying to write to HKCR, the possibility exists of it running into an administrative problem (on other machines). Is there a more universal way to set file association (for .NET 2.0) such as using HKCU or some other method that doesn't require administrative privileges.

string keyName = "Class";
string keyValue = "Class File";
string apppath = Application.ExecutablePath.ToLower() + " \"%1\"";
RegistryKey key;
key = Registry.ClassesRoot.CreateSubKey(keyName);
key.SetValue("", keyValue);

RegistryKey iconkey;
key = Registry.ClassesRoot.CreateSubKey(keyName);
iconkey = key.CreateSubKey("DefaultIcon");
iconkey.SetValue("", Environment.CurrentDirectory + "\\resources\\musicfile.ico");

key = key.CreateSubKey("shell");
key = key.CreateSubKey("open");
key = key.CreateSubKey("command");
key.SetValue("", apppath);