Horde3D

Why does my Unix UnZip extract flat filenames with backslashes in them instead of a subdirectory tree?

Short answer: because that's how they're stored in the zipfile, and backslashes ('\') are regular filename characters, not directory separators.

Longer answer: older versions of WinZip (and, no doubt, some other clone zippers) stored filenames using backslashes as directory separators in violation of PKWARE's appnote, which specifies that forward slashes ('/') should be used. Newer versions of WinZip correct that bug, so if you created the archive in question, you should upgrade. If someone else did, you should ask them to upgrade.

There is no capability in Unix UnZip to treat backslashes as directory separators (since they're perfectly acceptable filename characters, just like colons, quotes, and pretty much everything other than forward slashes), so if you want to extract the archive as a subdirectory tree without hacking the source code, you'll need to rename the archive entries. See the next item for more information about that.

I've same problem in Xubuntu. It's better to use 7zip. It's free, crossplatform [win, mac, debian, ...] and gives better compression ratio [lzma]. I'm using 7z in winxp and xubuntu and there isn't any conflict or problems with directory names

Unfortunately, 7z is not installed by default *anywhere* that I know of.