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My friend compressed lots of photos into a zip archive using a MacBook, and uploaded it to Dropbox. I downloaded the zip and when I try to extract using WinRAR it gives this error, but extracts most of the files:

enter image description here

And when I try with 7-Zip, it gets stuck and gives this:

enter image description here

My OS is Windows 7 Home Premium 64 bit.

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Try to make a .rar file when you use winrar. Perhaps it works better. Otherway make on your Mac OS System a tar.gz file winrar can extract this.

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It's quite possible that the .zip file is corrupt. If your friend double-clicks on it in Mac OS X and Mac OS X's built-in default .zip decompressor seems to decompress it without giving a warning/error, that's no surprise since Mac OS X's default zip decompressor doesn't actually check the checksums.

Your friend should use the command-line zip utility in Mac OS X to check the zip file for correctness.

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