do you have a helper application installed and associated with the file type so Thunderbird can "open" it. For example word or DOC files.

''Lumbalumba [[#question-1198684|said]]'' <blockquote> I am using TB 52.5.2 Since I have installed it on a new macbook pro 2017, attachments do not open any more if I click on them like before. I can save them in, for example Downloads, and from there open them, but not directly from the email any more. I tried all the tricks and tips I could find on internet but no solution so far. Any help? </blockquote> ''Matt [[#answer-1061861|said]]'' <blockquote> do you have a helper application installed and associated with the file type so Thunderbird can "open" it. For example word or DOC files. </blockquote> ''Lumbalumba [[#question-1198684|said]]'' <blockquote> I am using TB 52.5.2 Since I have installed it on a new macbook pro 2017, attachments do not open any more if I click on them like before. I can save them in, for example Downloads, and from there open them, but not directly from the email any more. I tried all the tricks and tips I could find on internet but no solution so far. Any help? </blockquote> Thanks, this helped solving the issue.