Digital Record Object Identification (DROID)

DROID is a software tool developed by the UK National Archives that performs automated batch identification of file formats. It is designed to meet the fundamental
requirement of any digital repository to be able to identify the precise format of all stored digital objects and link that identification to a central registry of technical information about that format and its dependencies. It uses internal and external signatures to identify and report the specific file format versions of digital files. These signatures are stored in a XML signature file generated from information recorded in the PRONOM technical registry. New and updated signatures are regularly added to PRONOM, and DROID can be configured to automatically download updated signature files from the PRONOM website via web services. See also: PRONOM.
Reference: DROID website [http://droid.sourceforge.net/]