SetRegistryKey and application name

See more:

MFC

With MFC based applications (e.g. call it ABCD),
once one performs the:

SetRegistryKey("MyCompany")

and then issues a:

WriteProfileInt("MySect", "MyEntry", 12345);

the registry then gets an entry under:

HKCU\Software\MyCompany\ABCD\MySect\MyEntry.
How does the framework work out the app name when it only
gets the classname like 'CABCDApp' ? There must be some magic
or the code uses the .exe name under the covers as the app name ?

Cheers,
Siggy