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BSA (Bethesda Softworks Archive) are archives that contain resource files (meshes, textures, sounds, etc.). The GECK does not allow creation or editing of BSA files, but other tools do.— Bethesda GECK glossary[1]

A BSA file (or Bethesda Softworks Archive) is a type of archive data file used to store game assets in Gamebryo and Creation Engine games (with the BA2 format replacing it in Fallout 4 and Fallout 76). Other game data such as item, character, and world space information are stored within separate ESM record files. BSA and BA2 files are found in the Data subfolder of any parent game directory (i.e. where the game's .exe file is found).

Individual files can be extracted from BSA and BA2 archives using third party tools such as Bethesda Archive Extractor (B.A.E.).[2]

Files present in games

Fallout 3

  • Fallout - MenuVoices.bsa
  • Fallout - Meshes.bsa
  • Fallout - Misc.bsa
  • Fallout - Sounds.bsa
  • Fallout - Textures.bsa
  • Fallout - Voices.bsa

Operation: Anchorage

  • Anchorage - Main.bsa
  • Anchorage - Sounds.bsa

The Pitt

  • ThePitt - Main.bsa
  • ThePitt - Sounds.bsa

Broken Steel

  • BrokenSteel - Main.bsa
  • BrokenSteel - Sounds.bsa

Point Lookout

  • PointLookout - Main.bsa
  • PointLookout - Sounds.bsa

Mothership Zeta

  • Zeta - Main.bsa
  • Zeta - Sounds.bsa

Fallout: New Vegas

  • Fallout - Meshes.bsa
  • Fallout - Misc.bsa
  • Fallout - Sounds.bsa
  • Fallout - Textures.bsa
  • Fallout - Textures2.bsa
  • Fallout - Voices1.bsa

Dead Money

  • DeadMoney - Main.bsa
  • DeadMoney - Sounds.bsa

Honest Hearts

  • HonestHearts - Main.bsa
  • HonestHearts - Sounds.bsa

Old World Blues

  • OldWorldBlues - Main.bsa
  • OldWorldBlues - Sounds.bsa

Lonesome Road

  • LonesomeRoad - Main.bsa
  • LonesomeRoad - Sounds.bsa

Gun Runners' Arsenal

  • GunRunnersArsenal - Main.bsa
  • GunRunnersArsenal - Sounds.bsa

Courier's Stash

  • CaravanPack - Main.bsa
  • ClassicPack - Main.bsa
  • MercenaryPack - Main.bsa
  • TribalPack - Main.bsa

Fallout 4

  • Fallout 4 - Materials.ba2
  • Fallout 4 - Meshes.ba2
  • Fallout 4 - MeshesExtra.ba2
  • Fallout 4 - Misc.ba2
  • Fallout 4 - Nvflex.ba2
  • Fallout 4 - Shaders.ba2
  • Fallout 4 - Sounds.ba2
  • Fallout 4 - Startup.ba2
  • Fallout 4 - Textures[1-9].ba2 (9 individual files)
  • Fallout 4 - Voices.ba2

Automatron

  • DLCRobot - Main.ba2
  • DLCRobot - Textures.ba2
  • DLCRobot - Voices_en.ba2

Wasteland Workshop

  • DLCworkshop01 - Main.ba2
  • DLCworkshop01 - Textures.ba2

Far Harbor

  • DLCCoast - Main.ba2
  • DLCCoast - Textures.ba2
  • DLCCoast - Voices_en.ba2

Contraptions Workshop

  • DLCworkshop02 - Main.ba2
  • DLCworkshop02 - Textures.ba2

Vault-Tec Workshop

  • DLCworkshop03 - Main.ba2
  • DLCworkshop03 - Textures.ba2
  • DLCworkshop03 - Voices_en.ba2

Nuka-World

  • DLCNukaWorld - Main.ba2
  • DLCNukaWorld - Textures.ba2
  • DLCNukaWorld - Voices_en.ba2

Fallout 76

  • SeventySix - 00UpdateMain.ba2*
  • SeventySix - 00UpdateStream.ba2*
  • SeventySix - 00UpdateTextures.ba2*
  • SeventySix - 00UpdateVoices.ba2*
  • SeventySix - Animations.ba2
  • SeventySix - EnlightenExteriors01.ba2
  • SeventySix - EnlightenExteriors02.ba2
  • SeventySix - EnlightenInteriors.ba2
  • SeventySix - GeneratedMeshes01.ba2
  • SeventySix - GeneratedMeshes02.ba2
  • SeventySix - GeneratedTextures.ba2
  • SeventySix - Interface.ba2
  • SeventySix - Localization.ba2
  • SeventySix - Materials.ba2
  • SeventySix - Meshes.ba2
  • SeventySix - MeshesExtra.ba2
  • SeventySix - MiscClient.ba2
  • SeventySix - Shaders.ba2
  • SeventySix - Sounds01.ba2
  • SeventySix - Sounds02.ba2
  • SeventySix - Startup.ba2
  • SeventySix - StaticMeshes.ba2
  • SeventySix - Textures01.ba2
  • SeventySix - Textures02.ba2
  • SeventySix - Textures03.ba2
  • SeventySix - Textures04.ba2
  • SeventySix - Textures05.ba2
  • SeventySix - Textures06.ba2
  • SeventySix - Voices.ba2
  • SeventySix - WorkshopIcons.ba2

* - 00-prefixed archives are update content

References

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