Joining betterzip splitted files on windows?

I've created an archive of 2 files from a 6gb file on my mac. I've copied the files to a windows computer and haven't succeed to extract the original file from the zips.

Am I doing something wrong or this feature is not supported?

To join a split archive on Windows, you can use either 7-zip or HJSplit. The latter will join the parts together and you can then open it with any archiver you have on Windows while 7-zip will do both in one step. Both tools are free.