While there is no single "proper feature" definition for this specific file, the phrase in this context typically refers to:
: In the software and gaming scene, a "proper" tag indicates that a previous version of the file was released by another group but was flawed (e.g., it crashed, was missing files, or had bad crack instructions). A "proper" release is the fixed, fully functional version. otomi-games.com_2ZUCBN0S.rar
or a "sandbox" if you intend to run any executable (.exe) files found inside. While there is no single "proper feature" definition
The file appears to be a compressed archive from a site specializing in Otome games (story-based romance games targeted at women). was missing files