The kind of compression used for an entry in an archive
public enum CompressionMethod : int
BZip2 compression. Not supported by #Zip.
An extension to deflate with a 64KB window. Not supported by #Zip currently
Common Zip compression method using a sliding dictionary of up to 32KB and secondary compression from Huffman/Shannon-Fano trees
LZMA compression. Not supported by #Zip.
PPMd compression. Not supported by #Zip.
A direct copy of the file contents is held in the archive
WinZip special for AES encryption, Now supported by #Zip.