For the correct display of 2dfx effects in the mod files, you must install Overdose Effects.
Requirements: - Modloader - CLEO 4.4 - III.VC.SA.LimitAdjuster or other is also needed
Note: You should also check if the IDs of the new mod files are being used elsewhere in your game: 18711, 18712, 18713, 18714, 18715, 18758, 18777. If anything, replace with others.