Hexadecimal
I suspect that the use of the word "hexadecimal" is misleading; I imagine
your files are in binary and you want to EDIT them in hexadecimal.
[Hey, I could have this wrong; you might have some sort of "hexadecimal dump
as ASCII text" file that you want to edit. But I doubt it].
If I need to edit a binary file in hex form, I most often use NewZap,
something I got from the Fish series long ago. NewZap allows you to edit the
contents of a file's disk sectors. (Don't know where it might be in the
download libraries here, but I'm sure somebody will have that information).
NewZap does NOT, however, allow you to add to or delete from a file.
For more general work, I believe that some editors (say, UEdit) allow you to
work on pure binary files. But I haven't used them in this way. Personally,
I'd most likely write a little ARexx program to do whatever file rechopping was
wanted.
Suggestions, anyone?
–Jim