As what title said, how should I open this file? It was a executable(application/x-executable) file.
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That all depends on what it is...
Generally speaking, you can use
I see you've tagged the question as "executable", so I assume it's a program of some sort? If that's the case, first verify the following: Do you know exactly where the file came from originally; Do you trust the source; Do you know exactly what the program is supposed to do? If the answer to any one of these three questions is "no", then please do NOT try to run it.
If (and ONLY if) the answer to all of the above was "yes", though, then in a terminal you would navigate to the folder containing the file and write
have you tried ./testing in your terminal? if it's not working due to permission, try to type chmod +x ./testing before redoing ./testing
(you need to have your testing file in your working directory)
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