Handling Zip Files Without Third Party Lib in .NET 4.0?

There is a similar question for 3.5 here:

Is there a built-in zip library in .NET 3.5?

that speculated that 4.0 would have it, but I can't find any info about it. If not, does anyone know why not? Seems like it would be fairly high on the list of things to include support for.

Take a look at the System.IO.Packaging namespace, which contains support for ZIP files, but not all of the features of ZIP files.

Still, it might be enough for your needs.

You may have already moved along, but ZiP API is added in .NET 4.5

http://msdn.microsoft.com/en-us/library/system.io.compression.ziparchive.aspx

go nuts.