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I recently downloaded a large number of GIS data files from a government agency to a file server and need to unzip all of them via the command line. However, unzip filename.zip is returning "Unsupported compression method 14". What does this mean? How can I extract the files?

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migrated from serverfault.com Oct 27 '11 at 20:36

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up vote 9 down vote accepted

These files were compressed using the LZMA algorithm (possibly using WinZip). LZMA archives are not supported by the unzip command. I found that I could extract these files using 7z instead, as follows:

  1. Install p7zip (from source or package manager)
  2. 7z x filename.zip
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WinZip specific compression method codes are available here. –  jscott Sep 30 '11 at 0:35
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