Hi apollos70, I am running Thunderbird 38.1.0 (the latest version) on Windows 7 (x64). Are you also on Windows? What version of Thunderbird are you using?

I have no difficulties opening Office 2010 files from the attachment pane while composing a message. You say that "...files will not open from that view." Would you please be more specific? What exactly happens? Does the popup asking what you want to open the file with still show? Is there an error message? Please describe the event step-by-step.

Thanks, Norio

I'm running TB 38.1.0, Win 7 64-bit. Absolutely nothing happens when I click on a MS file in the attachment pain. Even if I right-click and then select open, nothing happens.

I'm running Webroot Secure and Malwarebytes, but see nothing quarantined or sandboxed.

Still puzzled, but thanks for letting me know it works for you.

When I updated to Thunderbird 38.1.0, it acted oddly (e.g., correct email address(es) would not show in the To: field when I replied to a message; the last address I used would populate the To: field when I composed a new message; etc.). I got really frustrated with the update. Then I started Thunderbird in safe mode, and then restarted it in regular mode, and all the problems went away. You might try that, because it's simple to do, although it may not help.

Thanks for the suggestion, but after confirming I had started in safe mode, the problem persists.

I'm not sure but open Tools/options/attachment/incoming and see how office-files will open.

The defaults set for incoming mail are correct. However, my problem is with OUTGOING attachments. Nevertheless, thanks for the response. At least I know that is not an issue.

The way you open an incoming attached file resembles the way you check an outgoing attached file. My guess it uses the same instruction.

I cant open .docx or other office-files inside TB, have to use LibreOffice. and I don't have a suggestion in .../ Incoming so it uses Windows standard as a suggestion.