unar -q file.zip
Archive parsing failed! (Unknown error.)
Ended up with 4.1 instead of 4.8GB of data decompressed.
Are you using a 32 bit copy of zip and/or linux per-chance?
At $dayjob we encountered this quite a while ago and if I recall correctly we had a 32bit
version of zip and/or Linux
(I'm not convinced this is the answer, as you've already mentioned that you have a
copy with ZIP64_SUPPORT)