I want to insert code in an EXE file. Ofcourse it gives an error when I just insert some bytes. Is it possible to do this without some sort of tool, if not, with what tool can I do this?

Greetz

Howdy! yes , it is very possible to append code to an existing .exe file whose source you don't posses.
heck my tutorial at:
http://gam3room.virtualave.net/Decoding/Win32/Tutorials/CrackedPad.zip

Bye!
Hope that helps!

Latigo

Try reading some of the tutorials at http://www.immortaldescendants.org/ and for practice go to http://reversecourse.cjb.net

Ok, thanks

hehe i forgot...also you can go to my good friend SantMat's site at http://reversemes.cjb.net/ for more practice and tutorials

You could try the site I put up dedicated to this sort of reversing at http://www.codeinjection.cjb.net At the moment it is a library for this sort of thing and currently contains many essays which I have gathered relating to inserting code. Hope it can be of some use.