Wikipedia notes that 7-Zip is an open-source tool used for high-ratio file compression.
It is highly probable that this refers to one of the following: MAIS.7z
A 7-Zip file containing a visual novel, a game's story assets, or a collection of digital stories. Wikipedia notes that 7-Zip is an open-source tool
Files related to a specific community project or mod where "MAIS" is an acronym or title. a game's story assets
Can you provide about where you saw this name (e.g., a specific website, Discord server, or game modding forum)?