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What utility or method can tell a file type accurately?

What utility or method can tell a file type accurately?

If we look at files in our browser's cache, usually there is no file extension (the gif, jpg, or swf).

Asked by: Guest | Views: 63
Total answers/comments: 3
Guest [Entry]

"Trid - ""TrID is an utility designed to identify file types from their binary signatures. While there are similar utilities with hard coded rules, TriID has no such rules. Instead, it is extensible and can be trained to recognize new formats in a fast and automatic way.""
File - ""File tests each argument in an attempt to classify it. There are three
sets of tests, performed in this order: filesystem tests, magic number
tests, and language tests."" (it's for UNIX but under Windows you can use Cygwin)"
Guest [Entry]

"You can use File for Windows. It behaves like the UNIX file utility.

C:\Documents and Settings\Administrator>file file.c
file.c: C program text"
Guest [Entry]

Can't you just go Tools/Folder Options/View/, check Show hidden files and folders and also uncheck Hide extensions for known file types?