new road junction

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No,a hex editor lets you edit a file at the hex decimal level. Basically its a byte editor with each byte being represented by 2 numbers in a base16 format so it goes from 0-F. The normal number system you are used to, 0-9 is decimal or base10. Same way that PD will make byte level changes to the executable after determining what changes to make using a disassembler. If you can understand a file format, a hex editor can allow you to do all kinds of things to it.