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BSAOpt
What it is
BSAopt is a free, open-source Windows utility for managing and recompressing BSA archives. It treats archive contents like directories, making individual files easier to address, and can deduplicate files. Depending on the chosen input and output, its operations include Copy, Pack, Unpack, and Convert. The listing describes compression improvements of roughly 5% for files and 20% for WAV files. BSA and ZIP are listed as supported formats, with archive extraction and mod packaging also supported. Its version history includes Morrowind support, Fallout compatibility, and Xbox-type archives. Version 1.6.3 added recognition for XWM, FUZ, OGG, GID, and PEX files. Optional log files and a dialog that can attempt recovery from broken BSA headers are also listed. The application is partially multi-threaded and supports 32-bit and 64-bit Windows Vista or later. With UAC enabled, it must be run as administrator. The repository identifies Ethatron as the project owner and says BSAopt was forked from NIFopt.
For and against
For
- Can deduplicate archive files
- Includes Copy, Pack, Unpack, and Convert operations
- Supports 32-bit and 64-bit Windows
- Optional logs and corrupt-header recovery attempt
Against
- Requires Windows Vista or later
- UAC users must run it as administrator
- Listed version 1.6.3 was last updated 14 January 2013
The verdict
BSAopt provides archive operations and file handling for Windows users, with support noted for several game-related archives and file types. It is free and open source, but its Windows and administrator requirements are worth checking first.
Who it suits
BSAopt may suit Windows users who need to inspect, convert, package, or extract BSA and ZIP archives, including those working with the listed game formats.
Plans and prices
BSAopt
No paid plans stated
Read 9 Oct 2026 · github.com
On the record
- Archive operations
- The source code exposes Copy, Pack, Unpack, and Convert operations based on the selected input and output.github.com · read 9 Oct 2026
- Compression
- The listing says it can compress files roughly 5% better and WAV files 20% better.nexusmods.com · read 9 Oct 2026
- Current listed version
- The Nexus Mods listing identifies version 1.6.3, last updated 14 January 2013.nexusmods.com · read 9 Oct 2026
- Deduplication
- The product listing says BSAopt can deduplicate files in BSA archives.nexusmods.com · read 9 Oct 2026
- File type support
- Version 1.6.3 added recognition for XWM, FUZ, OGG, GID, and PEX files.nexusmods.com · read 9 Oct 2026
- Formats and games
- The version history lists Morrowind support, Fallout compatibility, and Xbox-type archive support.nexusmods.com · read 9 Oct 2026
- License
- The source file states it is available under either the Mozilla Public License 1.1 or GNU Library GPL version 3 terms.github.com · read 9 Oct 2026
- Logging and recovery
- The version history lists optional log files and a broken-header dialog that can attempt recovery of files from corrupt BSAs.nexusmods.com · read 9 Oct 2026
- Maker
- The repository identifies Ethatron as the project owner and describes BSAopt as forked from NIFopt.github.com · read 9 Oct 2026
- Purpose
- BSAopt manages and recompresses BSA files, treating them like directories so files inside can be addressed easily.github.com · read 9 Oct 2026
- Supported Windows versions
- The listing says BSAopt requires Windows Vista or later and supports 32-bit and 64-bit Windows.nexusmods.com · read 9 Oct 2026
- Threading
- The listing describes the application as partially multi-threaded.nexusmods.com · read 9 Oct 2026
- UAC requirement
- The listing says users with UAC enabled have to run BSAopt as administrator.nexusmods.com · read 9 Oct 2026
