Can't register my program in RegisteredApplications / Windows 8 Desktop

I' trying to get my application associated with mailto handler. In Windows 8 it is possible only through Default Program association, so I need register my application and then call

IApplicationAssociationRegistrationUI *applicationAssociationRegistrationUI = 0;

CoCreateInstance(CLSID_ApplicationAssociationRegistrationUI,
                     0,
                     CLSCTX_INPROC_SERVER,
                     IID_IApplicationAssociationRegistrationUI,
                     (LPVOID*)&applicationAssociationRegistrationUI);

if (applicationAssociationRegistrationUI)
    applicationAssociationRegistrationUI->LaunchAdvancedAssociationUI(L"MyApp");

So user can enable association.

However I just can't get registered.... I have added following registry entries:

HKCU\Software\
              MyFirm\
                     MyApp\
                           Capabilities\
                                        ApplicationDescription = "MyApp Description"
              RegisteredApplications\
                                     MyApp = "Software\MyFirm\MyApp\Capabilities"

What do I missing? Application doesn't shows in Default programs list, and association UI doesn't start at all...

P.S.: Have also tried with HKLM, but nothing helps...

Thank you in advance!

Solution

Capabilities must be under HKLM. Here's the set of Registry settings you need to see your mailto handler application in Default Programs on WIndows 8:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\my.mailto]
@="URL:MailTo Protocol"
"EditFlags"=dword:00000002
"FriendlyTypeName"="My Mail Client"
"URL Protocol"=""

[HKEY_CLASSES_ROOT\my.mailto\shell\open\command]
@="\"C:\\my-folder\\my-mail.exe\" \"%l\""

[HKEY_LOCAL_MACHINE\SOFTWARE\MyFirm\MyApp\Capabilities]
"ApplicationDescription"="Capability to send e-mail."
"ApplicationName"="A mail app"

[HKEY_LOCAL_MACHINE\SOFTWARE\MyFirm\MyApp\Capabilities\URLAssociations]
"mailto"="my.mailto"