This is "Kitserver" - an extension module for Sider 6 and Sider 7. Full documentation and usage is explained here.
PES 2017 Kitserver Overview Kitserver is a powerful management tool for Pro Evolution Soccer 2017
[livecpk] enabled = 1 cpk.root = ".\kitserver17\live"
Although PES 2017 is several years old, the modding community remains active. Here are three legendary packs that rely entirely on Kitserver:
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[lodmixer] multiplier = 2.5
Graphics are everything in a simulation. Kitserver allows for "Face" and "Hair" servers where you can import high-quality 3D face models for players who look generic in the default game. It also allows for , letting you change the weather, time of day, and sky textures for better visual realism.
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