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Old 12-22-2018, 07:34 PM   #2
BetterRed
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Posts: 21,744
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Join Date: Mar 2012
Location: Sydney Australia
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@jackie_w - works for me today on Windows 10 1803, viz:

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If I select Choose another app I get

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As you can see calbre's viewer is the default.

A couple of months ago I had some problems with Windows Open With on video files. There were some long threads at MS Support regarding it. It wasn't specifically video files, people had similar problems with images and other file types. IIRC there are some patches that explicitly addressed the issue. It got fixed with a subsequent update, seems to be OK now.

Make sure you have no outstanding Windows Updates, run a lightweight registry cleaner, and I have a vague memory of fixing an Open With problem with a System File Check in the long ago past.

For me Open With has been spasmodically problematic since it first appeared in Windows NT last century. I used to use Nirsoft's File Types Manager to overcome problems but I'm not sure it works these days.

BR
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