zpaq x archive dir -to newdir (extract and rename one directory)
zpaq x archive -to newdir/ (extract everything to newdir/everything)
In both cases, newdir/ will be created.
Also, I updated 10gb with packet 1.1 on system 4 and got a different result than yours.
3324783324 5857 430 4 packet 1.1 -r -m9 -b512 -h4
3008160754 4891* 470* 7 packet 1.1 -r -m9 -b512 -h4
Are you sure no files are missing? You can test like this: zpaq c 10gb.zpaq -force (with 10gb/ in current directory)
For me it shows 62 missing empty directory trees (62 of 83437 files differ) but all regular files verify OK.
I have a bunch of compressors to catch up on for 10gb, LTCB and silesia.
Edit: your results show 79431 files, which is the right number.
Edit: testing in 32 bit Vista:
It runs OK in 64 bit Ubuntu under wine.
This version of C:\tmp\packet.exe is not compatible with the version of Windows
you're running. Check your computer's system information to see whether you need
a x86 (32-bit) or x64 (64-bit) version of the program, and then contact the sof
packet.exe: MS-DOS executable PE for MS Windows (console)
Edit: tested on LTCB. http://mattmahoney.net/dc/text.html#2171