The .7z file you mentioned is a compressed archive. It is likely a backup or portable version of the game files or its associated Art Photo DLC.
Peach Territory is a developed by Yamate that primarily focuses on collecting "beautiful beauty" artwork through simple interactive mechanics. General Reception
You play as Xiao Xuan, who enters a hidden "peach blossom realm" after jumping off a cliff. The plot follows his journey as he falls in love, cultivates his skills, and attempts to defeat a devil.