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From the ZIP Files help topic:
Compression Factor: A numeric value indicating the level of compression (required). 0 or 10 = no compression(fastest method since files are simply stored; 1-9 = compression via the Deflate method varying from minimal compression/fast method (1) to maximal compression/slower method (9); 11-19 = compression via the Enhanced Deflate method varying from minimal compression/fast method (11) to maximal compression/slower method (19).
Note: Some older ZIP utilities cannot read files compressed with Enhanced Deflate compression.
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