Excerpts from alexander's message of 2010-03-31 23:44:27 +0200:
I think this is the best bet for windows and OSX is mentioned there as
well. I think .7z and .xz isn't the same, and .xz is certainly quite
new. .7z isn't that common on linux.
It's kind of hard to say what to use.. most compatible would be .zip I
think, .xz might offer the best compression ratio and .bz2 is somewhere
in between, supported by 7zip and winrar (both common on windows in my
experience). I don't know about OSX.
Since only betas of 7zip come with .xz support I'd go with .bzip2 and
maybe compare to .zip to see whether it's worth it.
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