Export Image as Binary
The Export Image as Binary command saves the image pixel data to a simple file containing only pixel values as contiguous binary numbers. The numbers are the same pixel type as those in the image. For example, if the image has 32-bit integer pixels, then the exported binary image has 32-bit integer values.
This command opens from the Save button drop menu on the main toolbar.
As shown here, the Export Image as Binary command simply opens a Save dialog and sets the file extension to .bin using the same base file name. You can change this if you wish..