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Tenacious .MPG video file handling bug

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So I want Firefox to "Always ask" when I click on an .MPG movie but it always opens it with QuickTime automatically.

"MPEG Video File" is already set to "Always Ask" in the Options / Applications but there's no such name with the tag "MPG" in the list.

I also set the file handling in Windows 10 to remove automatic opening of videos from QuickTime, the .MPG file type is set to my external MPC player in win10.

Even now, Firefox still opens .MPG with QuickTime automatically.

What to do to make Firefox pops up the "open with" window when clicking on an MPG video link?

So I want Firefox to "Always ask" when I click on an .MPG movie but it always opens it with QuickTime automatically. "MPEG Video File" is already set to "Always Ask" in the Options / Applications but there's no such name with the tag "MPG" in the list. I also set the file handling in Windows 10 to remove automatic opening of videos from QuickTime, the .MPG file type is set to my external MPC player in win10. Even now, Firefox still opens .MPG with QuickTime automatically. What to do to make Firefox pops up the "open with" window when clicking on an MPG video link?

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