(spoilers ahead)
So while I was playing, right around when Yuri killed herself I found a file in the directory named "have a nice weekend!" with this text:
G2pilVJccjJiQZ1poiM3iYZhj3I0IRbvj3wxomnoeOatVHUxZ2ozGKJgjXMzj2LgoOitBOM1dSDzHMatdRpmQZpidNehG29mkTxwmDJbGJxsjnVeQT9mTPSwSAOwnuWhSE50ByMpcuJoqGstJOCxqHCtdvG3HJV0TOGuwOIyoOGhwOHgm2GhlZpyISJik3J/
I don't know if this has been touched on yet, but maybe someone has some insight?