Quote:
Originally Posted by kovidgoyal
That's what a viewer is for. If you open it in an editor, calibre assumes, rightly, that you want to EDIT the file.
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The OP may be opening the read only files in the editor to see the CODE. "How was this done?" "I'll copy that into this other book."
Your original change to overwrite read-only files introduced a very unexpected behaviour, and was not even what the requestor asked for.