"Always use this program to open these files" is grayed out. Why?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Realization

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Chapters
00:00 &Quot;Always Use This Program To Open These Files&Quot; Is Grayed Out. Why?
00:30 Accepted Answer Score 31
01:06 Answer 2 Score 4
02:16 Answer 3 Score 4
02:35 Answer 4 Score 2
02:45 Answer 5 Score 1
03:04 Thank you

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Full question
https://superuser.com/questions/153465/a...

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Tags
#windows7 #windowsregistry

#avk47