4. The method of claim 1 , wherein a type, form or amount of the descriptive information varies for a plurality of different types of archive file formats.
4. The method of claim 1 , wherein a type, form or amount of the descriptive information varies for a plurality of different types of archive file formats. 5. The method of claim 4 , wherein the descriptive information is comprised essentially of a hash value of the contained file in uncompressed format.