File Signature Validation

I Have used a utility written by Mark Russinovich, it is used to validate the file signature. Any one have ideas how this can be done, i know it is not a simple code, but just i need some hints, APIs, steps, A guide map, Just to go in the correct direction. I read too much a bout the cryptAPIs, then I read too much about the certAPIs, b开发者_运维知识库ut i cannot get any thing useful to simply link a given file with the (unknown to me) data stored in the windows.

if any can help me in this issue please help, thanks a lot.

You should read about Authenticode.