Client Security

How i can prevent payers from entering with a different local/item.bmd client, if the player has knowledge of editing the item.bmd or just uses from another client with different ( for example ) defense set to armors, so when he enters the game he will have more defense, simply by manipulation of the client,
if the item.bmd is treated with CRC calculator, and fixed players can use whatever client configuration they want and enter server? is there a way to somehow pack the client together or use some kind of check to prevent the client modifications, i want players to play with the client i have configured for the server, thank you.

Try using molebox and pack it in main.exe or something, else you will need to get some antihack

can you be more accurate please, if you or someone else can provide me detail i need a solution for 97d version ,thank you.

MoleBox is a packing programs and you can pack random files into your main.exe so people cannot edit them or whatever.
check this:
http://forum.ragezone.com/f196/packi...t-dlls-823748/

this is absolutely what i am searching for, thank you much :).