Bug 84578 [Import/Export] Cannot import tar files with 8-bit filenames
On importing .tar.gz, the file is treated as a zip-file and produces a "Source file is not a valid Zip-file"-error message. This happens for all .tar.gz-files.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/TarInputStream.java
{
	private int nextEntry = 0;
	private int nextEOF = 0;
	private int filepos = 0;
	private int bytesread = 0;
	private TarEntry firstEntry = null;
	private String longLinkName = null;
	/**
	 * Creates a new tar input stream on the given input stream.