7z rom set unzipping issue

[SilverChin]

Can someone please help im trying to go completely go to bigbox without rlauncher but I have to unzip my rom sets and im getting errors when doing so."There are some data after the end of the payload data' . Can someone tell me if this is normal with 7zip or should I unzip these files with a different program and if so which one? This is going to take a long time to get everything done and I don't want to spin my wheels if possible.. please help

[CDBlue]

Typically, that error can be ignored.  From what I've experienced it's actually more or a warning that there was an issue in the archive, but it typically doesn't prevent the files from being correctly extracted.  More about this error on 7zip's forum (https://sourceforge.net/p/sevenzip/discussion/45797/thread/12f4a318/?limit=25)