All files of the same girl are part of the same zip. For example:
- Wicked_Yummy-Extra.zip.001
- Wicked_Yummy-Extra.zip.002
- Wicked_Yummy-Extra.zip.003
These 3 files are part of a single zip. You do not have to unzip each one separately. Unzipping the first one with 7zip unzips everything.
Cheers!