@Ramhound As for research effort, some sites (Stack Overflow, English Language And Usage) do a better job of calling out research expectations in their help centers than Super User appears to. From what I can see, there's a couple places suggesting that showing research effort is helpful (superuser.com/help/how-to-ask), (superuser.com/help/quality-standards-error), but nothing obviously called out at the top level, and nothing that states it's a reasonable reason to close a question.

@Ramhound I can see where "I have tried all the ways to do that but I couldn't download them." could have been changed to a more specific summary of what was tried and how they failed.

@DavidPostill — Given the nature of the answers on the question, plus the fact that the accepted answer of the "View files in ZIP archive on Linux" indicates that the asker was asking about the list of files, would it make sense to just reword the title and question for that one to make it explicit? So that once would be "View the list of files in a ZIP archive on Linux" with a similar change to the question body? That leaves things in a clear state, and the upvoted answers will agree with the texts for each question.

@DavidPostill — The problem in my opinion is that they have different info. The first question doesn't state at all how to view the contents of a single file within the ZIP, only the closed duplicate question does. So if that's what you're attempting to do (as it was in my case), you don't have a way of doing that from the open question. In fact, there is no open question (that I know about, at least) that actually answers that question. And it would seem inappropriate to move that answer to the open question, since it's not clear that that is the question being asked.