The .desktop extension dont work.
For resolve the problem use .thumbnailer extension with the different
mime/type content.
For example, for ogg perview :
1 - Create the file :
/usr/share/thumbnailers/ogg-thumbnailer.thumbnailer
2 - Put the content :
[Thumbnailer Entry]
Exec=/usr/bin/totem-video-thumbnailer -s %s %u %o
MimeType=application/ogg;application/x-ogg;video/ogg;
Or if you have ffmpegthumbnailer installed put the content :
[Thumbnailer Entry]
Exec=/usr/bin/ffmpegthumbnailer -f -s %s -i %i -o %o
MimeType=application/ogg;application/x-ogg;video/ogg;
Create other files for all mime/type perview you want.
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https://bugs.launchpad.net/bugs/769594
Title:
gsettings-desktop-schemas 3.0.0-0ubuntu1 fails to create thumbnailers
schema directory /usr/share/thumbnailers and necessary files within
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