AD1ifilename extension is associated with FTK Imager, an application included with Forensic Toolkit package developed by AccessData Group. Forensics Toolkit is a standard forensics software used all around the world.

AD1 is a proprietary format and contents of such files cannot be converted to other formats or viewed using any other image viewer than FTK Imager. AD1 files can be edited to some extent with FTK Imager.