do *NOT* try solution described below
*UNLESS* unless you know how to recover.

On 3/8/25 7:41 AM, Richard Owlett wrote:
My system is Debian 12.8 with MATE 1.26.0

It used to be that clicking on a PDF opened it with Atril.
I don't know what *I DID*, but it now opens with L3afpad.
                        ^
                        |
                        +--- I'm beginning to doubt I caused it

I assumed that Edit Preferences was the place to go.
But under Browser->Helper Applications it says "always ask" indicating system isn't getting that far.

I used to know what to do ;<
Help please.



*CAUTION* I date back to days of CORC and CUPL being current technology
          I've learned caution.
          I did the following as a _diagnostic_

Using root privileges I temporarily renamed "l3afpad".
Now clicking on a PDF uses atril to open it.
Also I now see:
richard@debian12:~$ xdg-mime query default application/pdf
atril.desktop
richard@debian12:~$

I do not believe using xdg-mime is a *legitimate" technique in this instance. It wasn't used to *cause* the problem. It *shouldn't* be used to supposedly "solve" the problem.

I know Caja can change what program opens particular files.

Two questions:
  1. What is Caja's method for changing default program to open a file?
  2. How do I diagnose the underlying problem?
     I spent over twenty years in QA/QC (even if hardware not software).
     That gives a certain mindset.

Suggestions please.


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