Download and install the latest version of Filestar.
Right click on one or more Bcstm file(s) on your desktop and select Convert with Filestar.
Type extract stems in the search box.
Press Extract.
Or let an AI agent do it: filestarcli -i file.bcstm -c "extract stems" (how).
Let your AI agent extract BCSTM stems
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Use Filestar to extract BCSTM stems in my Downloads folder”
Or run it yourself:
filestarcli -i file.bcstm -c "extract stems"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent extract BCSTM stems?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.bcstm -c "extract stems" on your computer, so your files stay on it.
BCSTM (Binary Cafe Stream) is a streamed audio format used by Nintendo on the 3DS platform. It stores compressed or PCM audio data optimized for streaming playback in games, as opposed to fully loading into memory. It is commonly extracted from game files for audio modding or playback with specialized tools.
