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SPECIFICTION
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BSAOpt

github.com

Free plan Windows
Visit github.com
Spec score 7.8 #9 of 25 in Game Modding Tools

What it is

BSAOpt is free, open-source Windows software for managing and recompressing BSA archives. It presents archive contents like directories, allowing files inside to be addressed directly, and can deduplicate files. Copy, Pack, Unpack, and Convert operations depend on the selected input and output. The listing says compression is roughly 5% better for files and 20% better for WAV files. Supported formats are BSA and ZIP, with archive extraction and mod packaging included. Version history lists Morrowind support, Fallout compatibility, and Xbox-type archives. Version 1.6.3 added recognition for XWM, FUZ, OGG, GID, and PEX files. Optional logs and a broken-header dialog can attempt recovery from corrupt BSAs. It is partially multi-threaded, supports 32-bit and 64-bit Windows Vista or later, and requires administrator execution when UAC is enabled. The listed version is 1.6.3, updated 14 January 2013.

Spec sheet

Purpose
BSAopt manages and recompresses BSA files, treating them like directories so files inside can be addressed easily.Read 9 Oct 2026 · github.com
License
The source file states it is available under either the Mozilla Public License 1.1 or GNU Library GPL version 3 terms.Read 9 Oct 2026 · github.com
Maker
The repository identifies Ethatron as the project owner and describes BSAopt as forked from NIFopt.Read 9 Oct 2026 · github.com
Archive operations
The source code exposes Copy, Pack, Unpack, and Convert operations based on the selected input and output.Read 9 Oct 2026 · github.com
Compression
The listing says it can compress files roughly 5% better and WAV files 20% better.Read 9 Oct 2026 · nexusmods.com
Current listed version
The Nexus Mods listing identifies version 1.6.3, last updated 14 January 2013.Read 9 Oct 2026 · nexusmods.com
Deduplication
The product listing says BSAopt can deduplicate files in BSA archives.Read 9 Oct 2026 · nexusmods.com
File type support
Version 1.6.3 added recognition for XWM, FUZ, OGG, GID, and PEX files.Read 9 Oct 2026 · nexusmods.com
Formats and games
The version history lists Morrowind support, Fallout compatibility, and Xbox-type archive support.Read 9 Oct 2026 · nexusmods.com
Logging and recovery
The version history lists optional log files and a broken-header dialog that can attempt recovery of files from corrupt BSAs.Read 9 Oct 2026 · nexusmods.com
Supported Windows versions
The listing says BSAopt requires Windows Vista or later and supports 32-bit and 64-bit Windows.Read 9 Oct 2026 · nexusmods.com
Threading
The listing describes the application as partially multi-threaded.Read 9 Oct 2026 · nexusmods.com
UAC requirement
The listing says users with UAC enabled have to run BSAopt as administrator.Read 9 Oct 2026 · nexusmods.com

Plans and prices

BSAopt Free No paid plans stated Read 9 Oct 2026 · github.com

Every BSAOpt plan and price →

Strong points and limits

Strong points

  • Free and open source
  • BSA and ZIP support
  • Archive extraction and mod packaging
  • Optional logging and corrupt-archive recovery
  • Supports 32-bit and 64-bit Windows

Limits

  • Windows only
  • Requires administrator execution with UAC
  • Listed version dates to 2013
  • Partially multi-threaded

Who it suits

BSAOpt suits Windows users who manage BSA or ZIP archives, including game mod packaging and extraction. It is aimed at users needing archive conversion, recompression, deduplication, or recovery options.

Verdict

BSAOpt provides focused BSA and ZIP archive operations with deduplication, recompression, and recovery features. Its Windows-only availability, administrator requirement under UAC, and old listed release are important constraints.

Where Specifiction places it

Alternatives to BSAOptAll alternatives →