If the link came from a TikTok comment or a "bio link" from an account with zero posts, it is likely a scam designed to steal your login info.
Often, these files are associated with "leaks." Reviews for these usually focus on: _TiktokerMilkTanker_zip
Run the file through a site like VirusTotal before unzipping. If the link came from a TikTok comment
It is likely a collection of videos, photos, or data related to a specific TikTok creator. If this is a collection of public videos, it’s a convenient way to view them offline. _TiktokerMilkTanker_zip
Never open unknown .zip files on your primary device. Use a "sandbox" or a secondary, disconnected device if you must check them.