Unfortunately it is not possible to compress or extract zipped files using cmdlets in PowerShell. This feature will be introduced in PowerShell 5.0, but for the time being using the System.IO.Compression.ZipFile class can be a nice workaround. The full article  is available on PowerShell Magazine : Compress files and folders with System.IO.Compression.FileSystem class

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[System.IO.Compression.ZipFile]::ExtractToDirectory('c:testing.zip', 'c:newtest')

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