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Re:After 5 Years there's a new 7zip non-beta release by eco on Thursday November 26, 2015 @03:59PM (#10634692)
It is the default. It's always worked for me just fine.
Re:After 5 Years there's a new 7zip non-beta release by rocky1138 on Thursday November 26, 2015 @05:03PM (#10634945)
You are so lucky. I've installed on every Windows machine I've had for years and have never had it work out of the box. I've got to right-click a .7z and choose open with -> 7zip.

I'll take a look at my setup when I get home tonight.

Re:After 5 Years there's a new 7zip non-beta release by cratering on Thursday November 26, 2015 @06:23PM (#10635176)
You can change the associations in the program settings but you have to be in administrator mode, otherwise they don't stick. http://www.7-zip.org/faq.html
Re:After 5 Years there's a new 7zip non-beta release by DiThi on Thursday November 26, 2015 @06:33PM (#10635204)
It doesn't associate on setup. You have to open 7zip, go to options and you see this http://i.imgur.com/12dpE7G.png

I usually click "Select all" then unselect ISO. Done.

Edit: other person replied it must be opened in Administrator mode. That explains why I didn't have it associated.