Is there any tool or way(tutorial) to do this?? Someone told me that this is a nice way of making file "dynamic"..

could you perhaps explain what you want better? Their are SEH chains, established in stack frames. But what do you mean by keeping the file dynmic?

I was exploring modifications of files to see which method bypasses which AVs, and I only got clue that SEH frames protection is the key for NOD bypass.. And I couldn't figure out how to get a result out of this clue

i was thinking what nolimit said

found these might be useful

http://www.madchat.org/vxdevl/papers/winsys/seh.txt

Maybe you mean using the default SEH as a method of starting code you've placed in the executable?

Maybe you can give some live example?

If thats to me,I don't know much about seh in files to bypass a/v's so i googled it and found that link.

ehh
find codecave in EXE,
write virus to code cave.
overwrite FS:[4] of main thread to point to the newly written code cave.

When an exception occurs in the main thread, KiUserExceptionDispatcher will dispatch to the default SEH handler, which you overwrote in FS:[4].