Recently there was a change in rules over on the GTA III boards due to a new glitch that allowed runners to rename a skin in order to gain an advantage in-game. This now creates a problem that skins allow you to gain an advantage using external software (OS). Skins that don't come with the game were then banned, along with MP3 files for the same reason.

This glitch is still present in VC, and while it doesn't give an advantage (that we currently know of) it still presents the issue of using external software to manipulate the game. We are going to take the same route as III in order to prevent any potential abuse in the future. There will be a week-long grace period (from the creation of this post) for you to remove any custom skins, and after this we will start rejecting runs that don't follow the new rules.

All runs that currently use custom skins or MP3 files will not be affected. Only those submitted on/after the 15th May 2020.

You can see a full write-up here - https://docs.google.com/document/d/1Vb6jh3hTZHkQyVs2PLBo6E-7QtYKdVuWa5-sp9mZiXo/edit?usp=sharing

TLDR - Starting 15th May, custom skins & MP3 files will be banned. No runs submitted prior will be affected.