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To make the maps appear in the list, you can package the index.bin file from the original data archive of the Hammers of Fate (DataA1\a1-data.pak) into a file with the .h5m extension and place it in the Maps folder of the Tribes of the East. Then, in the editor, press Resource -> Unpack MOD and select this file. For all of this, the archive with the campaigns must be in the data folder.