These are LevelDB database files. They are not meant to be accessed directly: The format may not be what you expect, it is not the same as a relational database model. You would typically access them directly through a scripting language like python and a leveldb library.
If you do however want to 'directly dive in and interface' with the database through a GUI, there are tools such as
http://protonail.com/products/keylord available.
Very interesting, I went looking for a GUI LevelDB tool some time ago and couldn't find one.
I guess the fact that it's called 'keylord' doesn't help when doing a google search. Maybe I went looking so long ago it didn't exist back then.
