xdg-open .pdf
Traceback (most recent call last):
  File "/usr/bin/mimeo", line 6, in <module>
    Mimeo.main()
  File "/usr/lib/python2.7/site-packages/Mimeo.py", line 2212, in main
    mimeo.launch(cmd, quiet=options.quiet)
  File "/usr/lib/python2.7/site-packages/Mimeo.py", line 878, in launch
    subprocess.Popen(args, close_fds=True)
  File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1327, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

4 archie@thinkpad /run/media/archie/Elements/Downloads % xdg-mime query default application/pdf                              :(
okular.desktop

archie@thinkpad /run/media/archie/Elements/Downloads % file -i .pdf
.pdf: application/pdf; charset=binary

---
archie@thinkpad ~/.config % cat mimeapps.list
[Default Applications]
x-scheme-handler/mailto=userapp-Thunderbird-29C2PX.desktop
message/rfc822=userapp-Thunderbird-29C2PX.desktop
application/x-extension-eml=userapp-Thunderbird-29C2PX.desktop

[Added Associations]
x-scheme-handler/mailto=userapp-Thunderbird-29C2PX.desktop;
message/rfc822=userapp-Thunderbird-29C2PX.desktop;
application/x-extension-eml=userapp-Thunderbird-29C2PX.desktop;

archie@thinkpad ~/.local/share/applications % ls -l
total 12
lrwxrwxrwx 1 archie archie   13 Nov 28 17:46 defaults.list -> mimeapps.list
-rw-r--r-- 1 archie archie 1484 Nov 30 14:04 mimeapps.list
-rw-r--r-- 1 archie archie   13 Nov 29 00:16 mimeinfo.cache
-rw-r--r-- 1 archie archie  175 Nov 29 00:16 userapp-Thunderbird-29C2PX.desktop

archie@thinkpad ~/.local/share/applications % cat mimeinfo.cache
[MIME Cache]

archie@thinkpad ~/.local/share/applications % cat mimeapps.list
[Default Applications]
application/json=emacs.desktop;
application/x-extension-htm=firefox.desktop;
application/x-extension-html=firefox.desktop;
application/x-extension-shtml=firefox.desktop;
application/x-extension-xht=firefox.desktop;
application/x-extension-xhtml=firefox.desktop;
application/x-httpd-php3=emacs.desktop;
application/x-httpd-php4=emacs.desktop;
application/x-httpd-php5=emacs.desktop;
application/x-mimearchive=firefox.desktop;
application/x-php=emacs.desktop;
application/x-shellscript=emacs.desktop;
application/xhtml+xml=firefox.desktop;
application/xml=emacs.desktop;
message/rfc822=firefox.desktop;
text/css=emacs.desktop;
text/english=emacs.desktop;
text/html=firefox.desktop;
text/plain=emacs.desktop;
text/x-asm=emacs.desktop;
text/x-c=emacs.desktop;
text/x-c++=emacs.desktop;
text/x-c++hdr=emacs.desktop;
text/x-c++src=emacs.desktop;
text/x-chdr=emacs.desktop;
text/x-csrc=emacs.desktop;
text/x-diff=emacs.desktop;
text/x-dsrc=emacs.desktop;
text/x-java=emacs.desktop;
text/x-makefile=emacs.desktop;
text/x-moc=emacs.desktop;
text/x-pascal=emacs.desktop;
text/x-perl=emacs.desktop;
text/x-python=emacs.desktop;
text/x-sh=emacs.desktop;
text/x-sql=emacs.desktop;
text/x-tcl=emacs.desktop;
text/x-text=emacs.desktop;
x-scheme-handler/about=firefox.desktop;
x-scheme-handler/chrome=firefox.desktop;
x-scheme-handler/ftp=firefox.desktop;
x-scheme-handler/http=firefox.desktop;
x-scheme-handler/https=firefox.desktop;
x-scheme-handler/unknown=firefox.desktop;
application/pdf=okular.desktop