DOCX, PPTX, XLSX in Registry

Is the Compatibility Pack responsible to add the content types for the following in the registry? If not, who is the one to add these in the registry?
[HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/vnd.openxmlformats-officedocument.wordprocessingml.document]
"Extension"=".docx"
[HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/vnd.openxmlformats-officedocument.spreadsheetml.sheet]
"Extension"=".xlsx"
[HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/vnd.openxmlformats-officedocument.presentationml.presentation]
"Extension"=".pptx"