After some thought about your question, I believe I know what you are asking. My deepest apology!
If I try to open 'calculator' which is on my desktop, I get the message on file associations. In fact, even things in the control panel have the same resuslt.
Another exampe is 'Windows...
At the forefront, please accept my deepest apology for this post as it pertains to many other posts with same subject:
this file does not have a program associated . . . in the Set Associations control panel.
Background: HP Pavilion 9000 running VISTA. On 1 Apr (I was the April fool), I...