How do I can check an input file is compressed (ZIP) or not?

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How do I can check an input file is compressed (ZIP) or not ?.

Is the solution to read the file info using "Get File Names" step and check the extension field ?

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Codek On
  1. Use the "file" command if you're on Unix.
  2. If not install cygwin and goto 1.

If this is related to your other question about conditionally reading different files then I would consider getting your files into a consistent format first. i.e. all compressed.