The file is an archive most likely associated with early development builds or patches for indie games or software developed by Afterschool Studio or similarly named projects.
The .7z extension indicates it was compressed using 7-Zip, a tool often used by independent developers to distribute build versions or patches to testers.
Based on version history and community forums, this specific file often relates to:
A horror-themed project titled Ayamachi released a v.0.2.1 build on the RPG Maker Forums . The game follows a group of students performing a ritual after school.