Question How to modify preinstall.img ?

#1 yes i did search the forum before i posted.
#2 all my findings were "within the device" related so its useless.
#3 i want to modify preinstall.img file and delete/add/replace garbage from there before i plug my phone into USB for wipe/flash.

Any windows applications that can do that ?
Maybe some basic program that reads/writes img files ?

Signature is not being checked for preinstall.img so it can be modified.

Thanks in advance.