[arvifilter]

well you can make ur job easier by adding the line at OnPlayerConnect so when player connects and needs to use the new feature it has the file^^:
for example when you add a new car system and you use dini system

Код:

public OnPlayerConnect(playerid)
{
       new path[100], pName[100];
       GetPlayerName(playerid, pName,sizeof(pName));
       format(path, sizeof(path), "%s.ini");
       dini_Set(path, carkey, -1)//-1 is means that player doesn't own any car
       //rest of the code
}

I hope this helps