thunderbird setup (version 60.0 on 64-bit Debian Stretch) PDF attachments are opened in
libreoffice showing generally useless gibberish. That is when I double-click. When I right-click, there is no 'open with ...' option, so to fix it I need to find the list of applications for opening PDF files.
Likewise, my favourite light-weight image viewer is
qiv, but PNG attachments in
thunderbird are opened in
gimp. Double- (or right-) clicking a PNG file always gives me an options dialogue with a list of programs to open it, with
gimp as the default. However,
qiv is not in that list.
So I would like to know
(a) is it possible to configure
thunderbird so that other programs can be selected to open certain files (in my case, having the option for PDF files and having a complete list for PNG files)?
(b) is it possible to configure my desktop (Xfce 4.12) so that I can set sensible choices (in my case, not letting
libreoffice open PDF files)?