1)   What's This File Type? 1.3.1
What's This File Type? tells you what a file is, and what program created it. All you have to do is right-click on the file, and select 'Bloody Hell! What's this File Type?' (other text available if you're sensitive).
file extension, file extensions, file, extension, extensions, type, file type,

 2)   File and mp3 tag renamer 2.2
File And MP3 Tag Renamer is a powerful, easy-to-use multiple file and mp3 renaming utility. With this powerful program ,you can quickly and easily batch rename files and mp3's with a number of possibilities and options.
file rename, mp3 tag, tag rename, mp3 renamer, rename mp3, file renamer, file extensions, batch, bulk, multiple,

 3)   File identifier 0.5.0
Command line tool that permits identification of different files, as well as extracting the metadata associated with those files. Furthermore, the identification part of the software is a text database that can easily be modified by the user.
utilities, file identification, file extensions, types, metadata, magic, xmp, dublincore, mime, file identify,