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File Associations
Microsoft obviously never imagined that you might want to dissociate a file extension from an application. To complicate matters, installation programs reassociate extensions all the time.
In Windows Explorer, select View, Options. In the Options dialog box, click the File Types tab. Look for the appropriate file type, which will probably be the extension name followed by the word File--for instance, ASU File. If you don't find it here, look under the application name.
You may be asking, "Why not just select the file, press Shift while right-clicking it, and select 'Open With' to permanently associate the file type with another application?" Here's why: If you don't investigate the Options dialog box, you won't know what other extensions are appended to this file type
In the Options dialog box, if the errant extension is the only one associated with the file type, while you have the type selected, click Remove, Yes, then Close.