Show 123

Download and install the latest version of Filestar.
Right click on one or more 123 file(s) on your desktop and select Convert with Filestar.
Type show in the search box.
Press Run.
Or let an AI agent do it: filestarcli -i file.123 -c "show" (how).

Let your AI agent show 123

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

Or add it in one click:

Claude Code:

claude mcp add filestar -- npx -y [email protected] mcp

Then ask your agent:

“Use Filestar to show 123 in my Downloads folder”

Or run it yourself:

filestarcli -i file.123 -c "show"

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 show 123?

Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.123 -c "show" on your computer, so your files stay on it.

Using Filestar With AI Agents → · Download SKILL.md

What is .123?

Name: Lotus 1-2-3 Spreadsheet
Extension: .123
Format: Binary
Category: Spreadsheet
Developer: IBM
Description: The 123 file format is a proprietary file format developed by the Lotus Development Corporation for use with its Lotus 1-2-3 spreadsheet software. It is a binary file format, which means that it stores data in a binary format that is not easily readable by humans.
MIME Type: application/vnd.lotus-1-2-3
Sample: sample.123
Wikipedia: .123 on Wikipedia

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