All are located in demise/system/demise.

These files were supposed to contain all strings but DEMISE.EXE reads them from the demise1.dll instead so they are useless.

DEMISEInfoStory.DED
DEMISEInfoDungeon.DED
DEMISEInfoGeneral.DED
DEMISEInfoItems.DED
DEMISEInfoMonsters.DED
DEMISEInfoQuest.DED
DEMISEInfoRaceGuild.DED
DEMISEInfoSpell.DED
DEMISEInfoTalk.DED

These are the main files which will be edited more or less.

DEMISEBountyData.DED
DEMISEData.DED
DEMISEDungeon.DED
DEMISEDungeonGroups.DED
DEMISEGuildTitles.DED
DEMISEItems.DED
DEMISELanguages.DED
DEMISEMainStoryline.DED
DEMISEMazeItems.DED
DEMISEMonsters.DED
DEMISEObjects.DED
DEMISEObjectsI.DED
DEMISEQuestData.DED
DEMISESketchData.DED
DEMISESoundData.DED
DEMISESpells.DED
DemiseSystemHeader.MSF
DEMISETextures.DED


Files created after system is initialized i.e. game run for the first time unless they already exist. In some cases after editing some of those files need to be deleted as they contain references to above files.

DEMISEAutomap.DED
DEMISEAutomapAnnotations.DED
DEMISEAutomapAnnotationsIndex.DED
DEMISEBountyIndex.DED
DEMISECharacters.DED
DEMISECompanionStore.DED
DEMISEGameBounties.DED
DEMISEGameNews.DED
DEMISEGameNewsIndex.DED
DEMISEGuildLogs.DED
DEMISEGuildMasters.DED
DEMISEGuildSpells.DED
DEMISEHallOfRecords.DED
DEMISEItemIndex.DED
DEMISELibrary.DED
DEMISEMazeItemIndex.DED
DEMISEMazeMonsters.DED
DEMISEMultiConfig.DED
DEMISEMultiData.DED
DEMISEObjectsISP.DED
DEMISEPartyData.DED
DEMISEStore.DED
DEMISEStoryIndex.DED
DEMISESystemData.DED

When server is run for the first time, MIS (Multiplayer) files are created, some are equivalents of above with same structure, just different extension.

DEMISEGuildSpells.MIS     
DEMISEBannedUsers.MIS
DEMISENews.MIS             
DEMISEGuildLog.MIS
DEMISENewsIndex.MIS       
DEMISEGuildMasters.MIS
DEMISELibrary.MIS         
DEMISEStore.MIS
DEMISEServerData.MIS       
DEMISECStore.MIS
DEMISEServerMonsters.MIS   
DEMISEHallInfo.MIS
DEMISEUsers.MIS           
DEMISEMessages.MIS
DEMISEStoryline.MIS
DEMISETransactions.MIS