Although I agree with the previous poster, you might also consider what you have in mind when you "open" one of these archives. For example, to list the contents of a gzipped tar archive, you might (first) try:
tar ztvf archive-filename
rather than the zxvf options that immediately extract the files. Why the caution? -- because you don't know if the files in the archive have absolute pathnames (which will install them on your system) or relative path names, which may still install them, but relative to the current directory (probably).
My suggestion: try man gzip, man tar and man zip as a starting point.
Hope this helps.
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