lazydog, you're right. I've made a test: I've downloaded this file again from the internet with home dir for downloads. And it's got permissions with that this message doesn't appear (screenshot).
I've understood: all my library was on another partition with NTFS. And, when I moved a file from it to home, system marked it as executable. Of course, I have to made chmod -x for my library folder because of it. Thanks everyone for the advices.
P.S. Though I've got the reason of it, but I don't know the behaviour of the system: it could consider FB2 as unknown type like APK for Android (screenshot), but it recognizes FB2 file as executable, as you know. And I can't understand logic of this.
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