I figured out what they are. They are files that are created when your game crashes. I have used the crash log analyzer, and it comes up unknown. So I'm just going to wait until seasons comes out and see if that fixes it. I'm not running any mods so I don't know what it could be.
When I just patched my dynasty file crashed every time I tried opening it. I did a factory reset, and tried a new file. It worked. I then went back to the old sims 3 file and opened a new savegame, that also stayed stable (I tuned the memory, population and moon settings in that file). Once it seemed stable e.i. letting me save/play for several days I once more tried opening my old dynasty file and it worked.
I don't know why it was suddenly working, but it's worth a shot right? I'm thinking maybe the game needed to get stabilized with all the new functions going on, and the dynasty file was just to bugged/large and had too much going on, so the game crashed.
Sorry if this is a rambling post, but I just wanted to share what ended up working for me.