The option for choosing the default viewer for images in the associated application is moved to Project Manager menu above the address bar.

>>

Project Manager viewport

Also 3rd version allows viewing any type of asset in a separate window. Whether is it an image, an HDRI file, a 3D FBX file, 3DS, BVH or IES file – any of these files you can view in high resolution in a separate window. The file in the window is updated when you change the file selection in the list. You can also save the selected view for a 3D file into the file’s gallery.
To opening a file in a separate window, find a related option on the menu or use the SPACEBAR key.

Applicable to: