Thanks, steveke. I just got 1713 myself, and answered my own question in the process. The big file I've got is 1710.dat, which apparently is a cumulative one for everything up to and including 1710. Plus there are now separate incremental files for 1711, 1712, and 1713. The confusion seems to be partly their file-naming system. Maybe the master could be named 1710cum (or whatever's currently appropriate), to distinguish it from incrementals by more than just sheer size.