A simple .bat script that decompresses the BSA and repacks them without compression.
The benefits are: Faster Performance.
Installation:
- Download BSARCH and place the executable in Fallout 3\Data
- Download FO3 BSA Decompressor and place the bat file in Fallout 3\Data
- Run Decompressor.bat and wait.....
- When done, you can delete: "Unpack" folder, BSARCH.exe and decompressor.bat
Before and after decompression:
Fallout - Meshes: 713mb to 1.66gb
Fallout - Textures: 1.04gb to 1.71gb
Every other BSA has no benefit of decompression, as they already are “decompressed”.
Uninstallation:
Verify your games files integrity
Instructions
Fallout 3 BSA Decompressor
Type: Main
Date uploaded01 Feb 2026
File Size311 B
Unique DLs0
Total DLs0
Version1.0
Fallout 3 BSA Decompressor