The Enable Advanced File Identification setting allows you to specify the method to use for advanced file type identification. Advanced File Identification (commonly referred to as magic numbers) enables Identity Finder to use the header information within a file to determine its type, rather than relying on the file's extension. When disabled, the file extension will be used to determine file types. When enabled, the following options are available:
E-Mail Attachment Compressed Files: Enables the feature only for E-mail attachments to detect if attachments are compressed files and then search them as compressed files. This is a common feature because zip files and other compressed files are commonly renamed when sending e-mails to circumvent server restrictions.
Included File Types: Enables the feature for all included files, as specified under, "Search the following file types." For any file whose extension is specified for the search, that file will be analyzed. If you intend to search *.txt files and test.txt is actually an RTF file, that file will be searched as RTF. If *.old files are not included in your search and test.old is actually an RTF, it will not be searched. To search that file, you would use All Files described next.
All Files: Enables the feature for every file searched so that if *.old files are not included in your search criteria, but test.old is actually an RTF file and *.rtf files are included in your search, test.old will be searched.
The When Identification Fails, Perform Text/Strings Extraction setting is a catch all that allows Identity Finder to extract any text from a file that cannot be identified so that any clear text will be searched for personal information.