Misnamed file

Definition
A misnamed file is a technique used to disguise a file’s content by changing the file’s name to something innocuous or altering its extension to a different type of file, forcing the examiner to identify the files by file signature versus file extension.

Source

 * NIST, Guidelines on PDA Forensics, Glossary, at 59 (NIST Special Publication 800-72) (Nov. 2004) (full-text).