[Help] i try open SC2.exe with IDA Pro

hi guys, can i help?
I did the following tests:

1. i try "attach -> local windows debbuger" when exe is in login board (account login) but when i write my information Starcraft 2 crash and ida send me this message: DC79455C: The istruction at 0xDC79455C referenced memory at 0xDC79455C. The memory could not be executed -> DC79455C
2. i try "disassemble a new file" with C:\Program Files (x86)\StarCraft but after the exe arrive to login board IDA say me "the process is terminated" or something

I want modify sc2 for create usefull dll for play better :beast:

Someone can help me?
I know asm and i study information of technology but my english is bad ;)
Thanks for everything anyway