[TakeiT]

Код:

mysql_format(MySQLCon, query, sizeof(query),"SELECT * FROM 'accounts' WHERE `Username` = '%s'", RPNU(playerid));

Should be

Код:

mysql_format(MySQLCon, query, sizeof(query),"SELECT * FROM `accounts` WHERE `Username` = '%s'", RPNU(playerid));

Vince is talking about 'accounts' in your query, the ' should be `