The naming convention The.Complex-PLAZA.part1.rar identifies it as the first part of a split RAR archive for the game , released by the scene group PLAZA . What is "The Complex"?

If you are diving into this specific "piece" of gaming media, here is what makes the experience "interesting":

The game often utilizes a VHS-style filter to enhance the feeling of watching a lost recording of someone trapped in another dimension. Categories Levels Archive - TresCom

The game excels at "Kenopsia"—the eerie feeling of being in a place that is usually full of people but is now abandoned.