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Open .docx attachment

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Opening MS Word documents never used to be a problem: double click and it opens in my Win10 / Office 2003 application. Since about a month (I am now on TB 91.5.0) opening .docx attachments is problematic: After double click, instead of opening the attachment in Word, a window opens to save the document, but without any suggested file-name. Opening .doc attachments is still fine, they open in Word.

What I see in the Message Source is that .doc attachments have "Content-Type: application/msword;". But .docx attachments have "Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document;".

My question: How can I instruct TB to open .docx documents in Word? Thanks!

Opening MS Word documents never used to be a problem: double click and it opens in my Win10 / Office 2003 application. Since about a month (I am now on TB 91.5.0) opening '''.docx attachments''' is problematic: After double click, instead of opening the attachment in Word, a window opens to save the document, but without any suggested file-name. Opening '''.doc''' attachments is still fine, they open in Word. What I see in the Message Source is that .doc attachments have "Content-Type: application/msword;". But .docx attachments have "Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document;". My question: How can I instruct TB to open .docx documents in Word? Thanks!

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Sorry! I found the solution: in Options >> Files & Attachments set Microsoft Word (Open XML) to "Use Microsoft Word".

(The problem was that, if I search in that list of attachments for "document", "docx", or "doc" it does NOT show this item.)