[The_Moddler]

pawn Код:

public OnPlayerConnect(playerid)
{
    new name[25], tmp[40];
    GetPlayerName(playerid, name, 25);
    format(tmp, 40, "/Users/%s.ini", name);
    if(fexist(tmp))
    {
       SendClientMessage(playerid, COLOR_GREEN, "hot damn sexy! You are registered! type /login [pass]!!");
    }
    else
    {
        SendClientMessage(playerid, COLOR_GREEN, "OMGWTFBBQ You arent registered! type /register to save your stats!");
        logged[playerid] = 0;
    }
    return 1;
}

Also check if your files end with .ini.