Export Binary Image
The Export Binary Image 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 Binary Image 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..