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Theoretically, we can add more information to each record. However, due to large involving positions, any additional information may make the whole EGTB becomes significantly larger. None of the popular EGTBs store any extra information for each item thus each record actually contains that integer only.
All records of an endgame are simply organized as two arrays (one array for one side/color). In other words, each item in those arrays is an integer and its index on an array is mapped to a unique position. For a given chess position, we will calculate its index then access its data record/integer via that index without searching.
Those arrays of an endgame can be stored in files. Typically each array is stored in one file. However, sometimes they can be combined into one file or device into more files to be easy to copy or manage. Those files may be in the form of none or compressed. If they are compressed, they are divided and compressed by small blocks thus they don't need to decompress all to extract data of just a few positions.
