This details the format of the realmlist.wtf file found in the WoW install folders. See Realmlist for information about the general WoW term. Realmlist.wtf is a Warcraft Text File that tells the WoW client which server to connect to. As of patch 2.1, a patchlist directive was added, presumably in conjunction with the new features of the World of Warcraft Launcher. During patch 3.0.2, the file was moved out of the main World of Warcraft folder into a subfolder (\World of Warcraft\Data\enUS\).