The CS can only merge all ESP plugins together, excluding masters. To edit a master file in the CS, turn it into ESP with Wrye Mash or tes3cmd, edit it, then turn it back into ESM. Master files cannot be set as 'Active file' in the CS, so the CS will only directly edit plugin files. The game and the CS will give a warning if the master file is different from the one that was recorded as parent. The CS will also properly load at most four Parent masters automatically when loading a plugin (Morrowind.esm, Tribunal.esm, Bloodmoon.esm, +Tamriel_Data.esm will load on their own if a file has them for parents) but will fail to load with five or more masters if they haven't been manually selected. If a file is listed as a 'Parent master' for a file that is being loaded, the game will load the parent master automatically, and fail if it isn't found. * OpenMW: Load order is explicit or by default alphabetical, master files aren't loaded before all plugins on principle, but are loaded before plugins that depend on them. Vanilla engine: Load order is defined by modified date and oldest files are loaded first, but master files are loaded before all plugin files. The difference is how the game and the CS (Construction Set) treat the files.

Wrye Mash and tes3cmd can instantly turn a master into a plugin, or the other way around. Public releases of TR's playable content (TR_Mainland) use the esm format internal versions of the file use the esp format.ĮSM and ESP files are identical except for a single byte in the header of the file. Elder Scrolls Master (.esm) and Elder Scrolls Plugin (.esp) are the content file formats of Morrowind.

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