Convert 123 to xlc

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 convert to xlc in the search box.
Press Convert.

Or let an AI agent do it: filestarcli -i file.123 -c "convert to xlc" (how).

Let your AI agent convert 123 to XLC

Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine. It works on Windows, macOS only.

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:

“Convert the 123 files in my Downloads folder to XLC”

Or run it yourself:

filestarcli -i file.123 -c "convert to xlc"

Runs on your computer, so your files stay on it. Works on Windows and macOS. 50 free conversions with the npm install, no account needed.

Can my AI agent convert 123 to XLC?

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

Using Filestar With AI Agents → · Download SKILL.md

What is the difference between .123 and .xlc?

Name: Lotus 1-2-3 Spreadsheet; Microsoft Excel Chart
Extension: .123; .xlc
Format: Binary; Binary
Category: Spreadsheet; Spreadsheet
Developer: IBM; Microsoft
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.; XLC is a chart file type created by Microsoft Excel, a spreadsheet program. It is a graphic representation of data in a spreadsheet. XLC files contain graphic information that can be used to create a chart from the data.
MIME Type: application/vnd.lotus-1-2-3; application/vnd.ms-excel
Sample: sample.123
Wikipedia: .123 on Wikipedia; .xlc on Wikipedia

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