I don`t use File Types option often, but it can be useful from time to time. I remember that I could find it in Windows XP under Tools | Folder Options | File Types, and there I could change various properties of all kind of file extensions.
File Types option is missing in Windows Vista/7. I don`t know what was the reason for dropping that option, but it`s missing.
Yes, you can always change “open with” option for every extension, but there were many other advanced options under File Types in Windows XP…
So, let`s just cut to the chase. If you’re missing all the options that File Types offered in Windows XP, there is a little freeware utility called FileTypesMan from company called Nirsoft.
It displays the list of all file extensions and types registered on your computer. For each file type, the following information is displayed: Type Name, Description, MIME Type, Perceived Type, Flags, Browser Flags, and more. FileTypesMan also allows you to easily edit the properties and flags of each file type, as well as it allows you to add, edit, and remove actions in a file type.