How could i modify an EXE to run a second program

so ive figured out that EXEs are written in Binary but can be read as Hex via SweetScape so technically i should be able to write code in batch to run a second program then convert the batch file to binary then to Hex and add it to the EXE right? im not sure how i can convert the Bat to Binary then to

submitted by /u/UnKown2Y0U
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from hacking: security in practice https://ift.tt/aDch8VC