jed may edit binary files as long as the proper precautions are taken. On
IBMPC systems, this involves calling the S-Lang function
set_file_translation with an integer argument. If the argument is
0, files are opened as text files; otherwise, they are opened in binary
mode. There is no need to call this function for other systems. However,
beware of the user variable ADD_NEWLINE which if non zero, a
newline character will be appended to the file if the last character is
not a newline character. If you are going to edit binary files, it is
probably a good idea to set this variable to zero.