Convert tnef to msg

  1. Download and install the latest version of Filestar.

  2. Right click on one or more Tnef file(s) on your desktop and select Convert with Filestar.

  3. Type convert to msg in the search box.

  4. Press Convert.

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

Let your AI agent convert TNEF to MSG

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:

“Convert the TNEF files in my Downloads folder to MSG”

Or run it yourself:

filestarcli -i file.tnef -c "convert to msg"

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 convert TNEF to MSG?

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

Using Filestar With AI Agents → · Download SKILL.md

What is the difference between .tnef and .msg?

Extension
.tnef
.msg
Format
Binary
Category
Email
Email
Developer
Microsoft
Microsoft
Description
File generated by Microsoft Exchange email programs such as Outlook; appears as an email attachment for email clients that don't recognize Microsoft's proprietary TNEF format; may cause the text "application/ms-tnef" to appear in the email if the email client does not recognize Microsoft Exchange formatting.
An MSG file is an email message, contact, appointment, or task created or saved within Microsoft Outlook. It may contain one or more email fields, which includes the date, sender, recipient, subject, and message body, or contact information, appointment details, and one or more task descriptions. MSG files are also compatible with other programs that use Microsoft's Messaging Applications Programming Interface (MAPI).
MIME Type
application/vnd.ms-tnef
application/vnd.ms-outlook

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