Verifying the checksum of a file

I need mq4 code to verify the MD5 checksum of another file, which will be in the libraries folder. It must not use any dll apart from the Windows DLLs. This can be done by importing Windows API functions such as OpenFile(), and then the MD5 checksum can be programmed in the ex4. This is about it, you just need me to send me the code in a script, I'll test it, and job done. Thank you.