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what would be the syntax to open a pdf reader on the attachment?

이 검토는 현재 부가 기능의 이전 (0.10.4) 버전에 대한 것입니다. 

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Does exactly what I need. I wrote a wrapper for handling files with a special content, now I can call that wrapper directly with 2 clicks. Thanks! :-)

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Works great. I regularly receive .DAT files (text files) and Thunderbird didn't know what to do with them.

This extension opened them up in Notepad, right from the mail interface.

이 검토는 현재 부가 기능의 이전 (0.9.0) 버전에 대한 것입니다. 

Thanks for using.

By the way, since Thunderbird 91.4.1, you can directly open ".DAT" files or such with correct viewer.

Check TB release notes from:
https://www.thunderbird.net/en-US/thunderbird/91.4.1/releasenotes/

> Temporary files created for forwarded attachments sometimes had the wrong extension