Download and install the latest version of Filestar.
Right click on one or more Sitx file(s) on your desktop and select Convert with Filestar.
Type convert to bzip2 in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.sitx -c "convert to bzip2" (how).
Documents - File Explorer─☐✕
This PC › Documents
Home
Desktop
Downloads
Documents
Pictures
Music
.sitxContract.sitx
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
ConvertMergeCompressExtractMoveZip
Let your AI agent convert SITX to BZIP2
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine. It works on macOS only.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the SITX files in my Downloads folder to BZIP2”
Or run it yourself:
filestarcli -i file.sitx -c "convert to bzip2"
Runs on your computer, so your files stay on it. Works on macOS. 50 free conversions with the npm install, no account needed.
Can my AI agent convert SITX to BZIP2?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.sitx -c "convert to bzip2" on your computer, so your files stay on it.
StuffIt X Archive (.sitx) is a compressed archive format introduced in 2002 as the successor to the classic StuffIt (.sit) format. It offers stronger compression than the original format and adds encryption, error correction, and self-checking features, while preserving Mac-specific data such as resource forks. It has been widely used on classic Mac OS and macOS for bundling and distributing files.
It is an open-source file compressor and decompressor that is freely available and uses the Burrows-Wheeler codec. It isn't a file archiver as it compresses single files.
