Starting with version 1.1, ZipIt can both compress and decompress files in PKZip 2.0 format, and is fully compatible with PKZip 2.04g, the latest version as of this writing. A new preference has been added to accommodate the new compression technique, called 窶彭eflation.窶 In the preferences dialog box, you may now choose to have ZipIt default to either deflation or implosion. If you choose deflation, then whenever you add a file to an archive, ZipIt will default to deflating the file, and will display 窶廛eflated窶 in italics to indicate this. If you choose 窶廬mplosion窶, ZipIt will use the old method. When you add a file, 窶廝est Guess窶 will be in italics, indicating that ZipIt will use its best guess to choose between implosion and shrinking (in most cases, ZipIt will choose implosion). You may always change the compression method used simply by choosing the new method from the Method menu. Note that 窶廝est Guess窶 now means the best PKZip 1.x-compatible compression. Deflation will always be more efficient, but will not be compatible with older versions of unzipping programs.
To summarize: If you want to create the most compatible archives possible, go to the 窶弃references->Compression窶 dialog and choose 窶廛efault compression: Implosion.窶 If you want to create PKZip 2.0-compatible archives, or don窶冲 care about compatibility but want the smallest archives, go to the 窶弃references->Compression窶 dialog and choose 窶廛efault compression: Deflation.窶 You can always override the default compression by choosing a new compression method from the Method menu.
