Ogg file detection.

Signed-off-by: Khral Steelforge <garuda2550@gmail.com>
Fix MP3 files doesn't have icon and some change in category name.

Signed-off-by: Khral Steelforge <garuda2550@gmail.com>
Add known files.

Signed-off-by: Khral Steelforge <garuda2550@gmail.com>