Another one of the many annoyances I came across in Windows Vista is its "nerfed" file and program association screen.
In previous versions of Windows, you could go to Folder Options -> File Types and be able to change program association or just delete file associations to reset them.
If you associated the wrong program with a file type or wanted to change a file types icon, you could easily do so.
Under Vista, you are simply allowed to change what program a file extension is associated to. That's it. You can't remove a program or do much of anything else without having to open up Registry Editor and browse to a key several branches deep.
I started working on a program that would make things a little easier.
Right now, all it does it remove all associations for the file for the current user, basically resetting the extension to defaults.
I didn't know what to call it, but you can click here to download the XdN File Association program.
Here is an image of what it looks like:
I've tested it under Vista and XP, and it works fine.