BSArch
🟡 Updated this year⚠️ Install Order · 5 steps
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview
🔍 Analysis
- 👍 0.8% endorsement rate
- 🏆 #25 of 57 Utilities mods in this game by downloads
📋 About This Mod
Packer and unpacker for Bethesda Game Studios archive files. Source Code
This is a standalone command line version of BSArchPro tool.
Supported games (archive versions):
-
[]Morrowind
[
]Oblivion[]Fallout 3 and Fallout New Vegas
[]Skyrim LE
[]Skyrim Special Edition
[]Fallout 4 General
[]Fallout 4 DDS textures
[]Starfield
- Starfield DDS textures
PACK ARCHIVE
BSArch.exe pack <source1+source2+...> <archive>
<sources> Path to the source folder, file or archive with file(s) to pack
Multiple sources can be provided using + without spaces
Files from later source win on matched file names
<archive> Archive file name to create
-tes3 Morrowind archive format
-tes4 Oblivion archive format
-fo3 Fallout 3 archive format
-fnv Fallout: New Vegas archive format
-tes5 Skyrim LE archive format (fo3/fnv/tes5 are the same)
-sse Skyrim SE/AE archive format
-fo4 Fallout 4 General archive format
-fo4dds Fallout 4 DDS archive format (streamed DDS textures mipmaps)
Always compress using -z parameter, game crashes otherwise
-sf1 Starfield General archive format
-sf1dds Starfield DDS archive format (streamed DDS textures mipmaps)
-split:N Split archives by N GB, 0 disables splitting
Don't use values larger than available free memory
When not set BSA archives are split by 2 GB, BA2 aren't split
Games before Fallout 4 have hardcoded 2 GB limit!
-z:type Compress files in archive using provided compression type:
zlib, lz4 or lz4f
When type is omitted use default compression for the game
Strings and audio files (except .fuz) are not compressed
-share:yes|no Identical files will share the same data in archive to preserve space
"no" to disable sharing, default: yes
-mt:yes|no Use available CPU cores for faster multithreaded processing
"no" to disable multithreading, default: yes
-af:value Override archive flags with a hex value
Oblivion, Fallout 3/NV and Skyrim archives only
-ff:value Override file flags with a hex value
Oblivion, Fallout 3/NV and Skyrim archives only
UNPACK ARCHIVE
BSArch.exe unpack <archive>
<archive> Archive file name to unpack
Path to the existing destination folder to unpack into
When not set un
BSArch is a command-line utility for packing and unpacking Bethesda game archives, supporting formats like BSA and BA2. With 5,464 endorsements and 727,050 downloads, it's a trusted tool for modders and advanced users who need to manage archive files outside of the game. Last updated in August 2026, it remains actively maintained.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Massive community trust – 5,464 endorsements and 727k downloads prove it's the go-to tool for archive work
- Actively updated (August 2026) so it stays compatible with current Bethesda games
- Command-line power means you can script and automate archive operations easily
⚠️ Cons
- No GUI – if you're not comfortable with command line, this will feel intimidating
- No in-game integration – you'll need to manually run it outside of your mod manager
- Documentation is minimal – you'll have to rely on community guides or trial and error
For mod authors and advanced modders who need to pack or unpack BSA/BA2 files for Bethesda games. If you're a casual player who just installs mods via a manager, you don't need this – skip it.
💡 Beginner Tips
- Run BSArch from the command line with -h to see all available options – it's the best way to learn the syntax
- If you're modding Skyrim or Fallout 4, make sure you use the correct archive format (BSA for Skyrim, BA2 for Fallout 4) to avoid issues
- Test packing a small mod first before processing large archives to ensure your command is correct
📊 Mod Details
- Game
- New Vegas Mods
- Author
- zilav
- Version
- 1.1
- Downloads
- 727,050
- Endorsements
- 5,464
- Category
- Utilities
- Created
- 3/21/2018
- Updated
- 8/7/2026
🔧 How to Install New Vegas Mods
Download from Nexus.
📖 Full step-by-step install guide for New Vegas →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for New Vegas commands, item IDs, and more.
Keep browsing — more New Vegas mods await