.ESM File Extension
File Type 1Elder Scrolls Master File
What is an ESM file?
Game data file used by The Elder Scrolls IV: Oblivion and The Elder Scrolls V: Skyrim single-player role-playing games; contains various kinds of data, including 3D meshes, textures, video, music, sound, and game menu data.
The primary data file referenced by The Elder Scrolls IV: Oblivion is named Oblivion and is located in the \Oblivion\Data folder. Custom ESM files can be viewed and edited using the Creation Kit or The Elder Scrolls Construction Set (TESCS).
NOTE: While ESM files are sometimes modified to create custom game mods, you can also use the .ESP format for adding game plugins.
File Type 2Fallout 3 Master File
.ESM File Association 2
Game data file used by the Fallout 3, a single-player post-nuclear fallout role-playing game; contains core data that is loaded when the game is run; includes maps, object data, object placement locations, character dialogue, gameplay settings, AI settings, and other information.
ESM files are not meant to be edited, but may be modded using a tool like The Garden of Eden Creation Kit (GECK). By altering files, such as the Fallout3.esm file included with Fallout 3, players can modify the gameplay.
NOTE: While ESM files are sometimes altered to create custom game mods, the .ESP format can be used for plugins.