5 つ星中 4つの評価を受けています

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

これは以前のバージョン (0.10.4) についてのレビューです。 

5 つ星中 5つの評価を受けています

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! :-)

これは以前のバージョン (0.9.0) についてのレビューです。 

5 つ星中 5つの評価を受けています

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.

これは以前のバージョン (0.9.0) についてのレビューです。 

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