Download and install the latest version of Filestar.
Right click on one or more Cpt file(s) on your desktop and select Convert with Filestar.
Type convert to gz in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.cpt -c "convert to gz" (how).
Let your AI agent convert Compact Pro Archive to GZ
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 Compact Pro Archive files in my Downloads folder to GZ”
Or run it yourself:
filestarcli -i file.cpt -c "convert to gz"
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 Compact Pro Archive to GZ?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.cpt -c "convert to gz" on your computer, so your files stay on it.
Compact Pro Archive (.cpt) is a compressed archive format used on classic Mac OS, created by the Compact Pro compression utility. It bundles multiple Macintosh files—including resource forks—into a single compressed archive, and served as a popular alternative to StuffIt in the early 1990s.
This is a compressed archive file that contains one or more files compressed by standard GNU zip (gzip) compression algorithm. It is mainly used by Unix OS.
