Finder "Always open with" ignored On my Macbook Air (El Capitan) - 

Why is it that when I select Open With&gt;Other... 

Enable all applications

check the checkbox Always open with



It still makes me do it all over again,... every time!!!

I am trying to open xml files with Chrome.  But every time I select one from Finder and do open with...  

If I just choose Open then XCode opens it.  

What does the Always open with checkbox actually do? Is it for decoration only, and has no function?  It doesn't do what I think it should.  Please advise.
If you want to open all xml files in Chrome, you need to click the Change All... button in the File | Get info (cmd+i) window.