: Users often use Offzip to pull textures or models from games like The Witcher 3 Editing Save Files
offzip.exe [options] [offset] Use code with caution. 1. Scanning a File for Compressed Streams
Once you have modified an extracted file, you need to turn it back into a compressed stream so it can be re-injected into the original archive. The basic syntax for Packzip is: packzip.exe [options] Use code with caution. 1. Standard Recompression
Offzip will print a log of every stream it encounters, displaying the file offset, the compressed size, and the uncompressed size. The extracted files in the output folder will typically be named after their hex offsets (e.g., 00001a40.dat ). Deep Dive: Using Packzip.exe
: By default, Packzip uses the best compression, but you can force different strategies with the -m option. This can help ensure the recompressed data is as close as possible to the original for compatibility.
This adjusts the window size of the zlib/deflate algorithm. Matching the original window size is crucial for successful decompression by the host application.
packzip.exe decompressed.bin compressed_output.bin
Offzip and Packzip are standalone executables that do not require a formal installation process. However, to use them conveniently from any command prompt, you can add them to your system’s environment variable.
In contrast, video games and embedded firmware often append or embed raw compression streams directly inside a larger executable or resource package ( .bin , .pak , .dat ). Because there are no file headers to guide standard software, the compressed data is effectively invisible. Offzip solves this by scanning the target binary byte-by-byte, looking for data characteristics that match specific compression algorithms. Supported Algorithms
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In Call of Duty modding, Offzip is used to decompress .FF (FastFile) files, which contain game scripts and assets:
To understand how Offzip and Packzip work, you must first understand . Deflate is a lossless data compression algorithm that combines LZ77 compression and Huffman coding. It powers .zip , .gz , and .png files, and is natively implemented via the Zlib library in thousands of video games and software applications.
: Controls the compression level, ranging from 1 (fastest, lowest compression) to 9 (slowest, best compression). Matching the original compression level can be crucial if the host program expects the compressed file to fit within a specific byte budget. Step-by-Step Recompression Example
This scans the file and lists found streams without writing anything to the disk. It is highly useful for initial analysis.
: Quiet mode. Suppresses screen output to speed up the extraction process on massive files.
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