It may be coincidental, but now I can't see into a zip I created with 10.0.0. Each file extraction says "unsupported compression method" (each file is correctly listed in the status report). What to do?
I may have told you wrong - it's possible the zip was the result of a Dropbox download*. I have performed the same download again, and I get a zip file which DOpus 10.5.7 won't list in the lister, but this time a manual extraction does retrieve the actual files (the previous zip won't even do that).
A multiple-file download from Dropbox is packaged as a zip, in this case 96 jpegs each about 7MB.