Editing Program Files
For years people have been editing binary program files with Qedit, but we have never said whether this should work. Now Qedit recognizes that you are editing a program file. The Text command prints a warning that you should only use the Change, List, and Keep commands on program files. Change does not let you replace a string with one of a different length, as this would invalidate the program file. Keep forces the new program file to have exactly one extent.