For what do you need a File Associator?
Many programs are changing the file extension(s), sometimes without any advise. If you want to open a file with a double-click it may cause an error or an unwanted application starts to process that file.
With the File Associator you may choose which files are associated with which program. Quick, easy and whenever you want.
Important:
With the backup function you can undo all file associations with one click.