[Juniiro3]

pawn Code:

CMD:changename ( playerid , params [ ] )
{
    new newName [ MAX_PLAYER_NAME ];

    if ( sscanf ( params , "s[24]" , newName ) )
        return SendClientMessage ( playerid , 0xFF0000FF , "[ERROR] Use /changename [ new Name ]" );

    SetPlayerName ( playerid , newName );


    return 1;
}

//OnPlayerDisconnect
if ( !fexists ( "LARP/Users/%s.txt" ) ) //format your string to do it
    fcreate ( "LARP/Users/%s.txt");

//Now, save player account in the new directory ;)

A base to make your command