It is useful in files ASSOC.Such as "HKCR\.mp3",it originality default value is "foobar2000.mp3",and "HKCR\foobar2000.mp3" contain some context menu "HKCR\foobar2000.mp3\shell\enqueue", "HKCR\foobar2000.mp3\shell\play".
If I change "HKCR\.mp3" default value to Winamp.file,the context menu will be lost.
So I want to copy the whole key "HKCR\foobar2000.mp3" to "HKCR\Winamp.file" and then doing FileAssoc.
This would keep the context menu.
These is a instance in ACDSee 3.1 SR1's FileAssoc.
Or somebody may a plugins like
CopyReg::Copy SRC_ROOT_KEY SRC_SUB_KEY DEST_ROOT_KEY DEST_SUB_KEY£¿