read exe file information .

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From the beginning i am hearing that exe consists of 3 main parts,
.rcsc
.text
.data
-some time these too
(.reloc)
(.ndata)
(.rdata)

exe file starts with magic sig "MZ".
exe file has an entry point called (EP).It has export table , import table, check-sums..

hummm strange...

My question is How do i open exe file to get this information,
packer , unpackers, pe scanner's and AV's are use this concept to examine a particular file.

code, documents any thing is welcome.

thanks for reading this gibberish.

_UPDATE_

For example :
Consider file.exe ,
i want to open this file and search for particular byte pattern.

For ex : ?? ?? ?? 5B 24 55 50 44 FB 32 2E 31 5D
this is byte pattern for packer called "$pirit v1.5"
?? are wildcard bytes.