List of file formats available for the preview: 

Here is the complete list of file formats supported by Smash for the preview on desktop. On mobile devices you should be able to preview any audio, video and documents instantly.
Let us know if you wish to have other formats be taken into account.

JPEG (Joint Photographic Expert Group) > jpg
JPEG (Joint Photographic Experts Group) > jpeg
JPEG (Joint Photographic Experts Group) > jpe
GIF (Graphics Interchange Format ) > gif
PNG (Portable Network Graphics) > png
TIFF (Tagged Image File Format) > tiff
TIF (Tagged Image File Format) > tif
TIFF (Tagged Image File Format) > tiff64
Hasselblad Digital Camera Raw Image Format > 3fr
Sony Raw Image format > arw
Canon Raw Image format > crw
Raw Image Format > cr2
Digital Negative > dng
Kodak Raw Image format > kdc
Konica-Minolta Raw Image format > mrw
Nikon Raw Image Format > nef
Olympus Raw File Format > orf
Pentax Digital Camera Raw Image Format > pef
Fuji Raw Image format > raf
Sigma Camera Raw Image format > x3f
Photoshop Data File > psd
Adobe Illustrator Artwork > ai
Encapsulated PostScript > eps
Scalable Vector Graphics > svg
Zip (Archive file format) > zip