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 gzip in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.cpt -c "convert to gzip" (how).
Let your AI agent convert Compact Pro Archive to GZIP
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 GZIP”
Or run it yourself:
filestarcli -i file.cpt -c "convert to gzip"
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 GZIP?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.cpt -c "convert to gzip" 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.
A compressed file format associated with GNU Zip (Gzip) that uses the DEFLATE compression algorithm, a combination of both the Huffman coding and the Lempel-Ziv (LZ77) codec.
