Which file extension is associated with Custom Content Images?

The file extension associated with Custom Content Images is commonly recognized as *.AD1. This format is specific to AccessData's Forensic Toolkit (FTK) and is used for creating custom disk images that include forensic metadata along with the data extracted from the source.

In forensic imaging, Custom Content Images help investigators manage their data more effectively, as they can encapsulate imaging data with relevant details like file system structure and shredding history. Using the AD1 format allows forensic analysts to ensure that they have a comprehensive representation of the original data in a way that is compatible with AccessData's suite of digital forensics tools.

Other file extensions mentioned, such as E01, AFF, and S01, relate to different forms of imaging formats or data structures but are not designed specifically for custom content within AccessData's environment. Therefore, the recognition of *.AD1 as the correct answer is based on its specific functionality and application in forensic investigations using AccessData products.