Is there any good reason to make that file editable? Was making it appear in Misc done to allow users to add there own file by that name or to edit it in some way?
Also, what a media type been assigned to that file?
I think we will have to special case that filename completely during all moves and renames. In Sigil-0.9.991 immediately after loading the epub but *before* standardizing it, if you mouse over that file in the BookBrowser, what does it report as it bookpath? Does it report that it is in META-INF?
If so simply skipping any bookpath with META-INF at the start of the bookpath would probably be useful.
I have no epubs with that file to test with so if someone could make a testcase available privately that would help or even just show me what is in one of these files and I will create my own testcase.
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