When right-clicking a file you may see an option called Open With, which contains a list of programs to open the file with. Information provided in this article helps you remove unwanted entries from the Open With listing on a per file-type basis. For the purposes of illustration, examples in this topic use a .xyz file type, and xyzfile as the ProgID for .xyz file type. read more...
... anyone knows where we can find an app that does this trick (without getting in to "regedit")
Related applications:
1. XpAssociate
2. File Association Editor
3. FastExplorer