Version 16.2 and muti-volume zips

[Joey Picinich]

I have a multi-volume zip file x.x01, x.z02 and x.zip. There are 2 files in the zip but 3 are extracted. The 3rd file shows as a copy of the 2nd. The only thing see different is that in the list of archived files, the 3rd one has a PropertyID of 80 and it is equal to 0. Why am I showing 3 files when there is only 2 and what is PropertyID 80. I have checked the spec and web and cannot find anything.

[Igor Pavlov]

80 is kpidVolumeIndex

show the list:

7z l x.zip -slt

Thare are two copies of metadata in zip: local and central headers.
And maybe 7-zip thinks that some metadata records refer to different files.
What program was used to create that archive?