Compress New

If checked, ZipStream will compress newly created files. 

Having this option not checked is most useful when you wish to manually 
compress files with ZSPack to establish your compressed environment and 
you do not want any further automatic compression to take place. e.g. You 
have a Word Processing program that you compressed with ZSPack, but you do 
not want any new files created by the Word Processor to be compressed.