When you receive a ZIP file from a Windows user, umlauts and other non-latin1 characters in filenames may look corrupt, and probably will be corrupt when extracting the ZIP file.

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The reason is encoding: Such archives are probably using Codepage 850. I am serious, 1987 is calling.

Fortunately, the unzip command can handle such files like so:

unzip -O CP850 file.zip

Interestingly enough, Rubyzip also compresses files that way. Probably so files look alright to Windows users.