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There is a zip/unzip option in the context menu so is it accessible from the command line?

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Yes and no.

The yes:

rundll32.exe zipfldr.dll,RouteTheCall filename.zip

would open the file in the explorer as a "compressed folder" similar to clicking open a zip folder

The no:

There is no other entry point in zipfldr.dll that allows decompressing files directly from command line. I would suggest using the 7zip command utilities or unzip.exe as these are free (as in freedom as well as in beer)

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If you already have Java JDK on your PC, and the bin directory is in your path (in most cases), you can use the command line:

C:\Program Files\Java\jdk1.7.0_45\bin>jar xf test.zip

Complete set of options for the jar tool available here.

Examples:

Extract jar file

jar x[v]f jarfile [inputfiles] [-Joption]
jar x[v] [inputfiles] [-Joption]

If you don't have JDK installed I would recommend installing 7-Zip, since it's very lightweight: http://www.7-zip.org/

Examples: http://www.dotnetperls.com/7-zip-examples

Source: http://stackoverflow.com/a/1021592/475876

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No it doesn't by default, but check here to do it anyway: http://stahlworks.com/dev/index.php?tool=zipunzip

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