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.
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. AfterSchool_V0.2.1.7z
Developed by Afterschool Studio , this game released Patch 0.2.1 (referenced as "Supply Drop") in August 2022. The compressed archive typically contains the Unity-based game data, including executable files and streaming assets. including executable files and streaming assets.