Disaster averted- I recreated the deleted pz3's that I know were deleted , as I bought them & unzipped the orig again. They were in 3 different folders, & all pz3 in the 3 folders were deleted, with no pzz created.. None of the others seem to have this problem, & I have hundreds of files- most of them were already compressed from the original python script. I don't know what to say- very strange indeed. I still appreciate your help. Could be a one time fluke, possibly.