I have vague memories that things like Shift JIS file names get scrambled? IIRC it was a case of it using the users default non-Unicode / “ANSI” codepage instead of offering a selection like Winzip apparently does.

In the extracted contents. Various assets for Unity would come with folders and file names in Japanese. 7zip would extract them without the proper names and so all relative patching would be completely messed.

Winrar does it fine.