The Vista/Windows 7 Boot Manager data in Boot/BCD is simply a registry hive and can be read using a tool like reged.

It contains stuff like /Description/TreatAsSystem, /Description/GuidCache and a whole bunch of guids under /Objects. Presumably, the actually interesting data is there, but unfortunately, it’s all binary.

A guy named Geoff Chapell has some info on what it all might mean.