The "x" in names matches the player number (1 to 11). For a description of the two signatures see GENx.DAT.

For starships, planets and starbases there is a .DAT and a .DIS file. The .DAT file contains changes made by the player. The .DIS contains the information as extracted from the RST file (.DIS = "discarded"???). MAKETURN looks for differences between these and makes a TRN file. The .DIS files are generally not modified during a turn, clients only modify the .DAT.