[DiapDealer]

People also need to keep in mind that the "Sigil used to be able to open this epub" mantra is not always going to be relevant after Sigil v1.0. The open "As Is" direction that Sigil is moving toward means that there could be broken epubs that Sigil might not be able to open successfully. Our primary goal is to make sure that none of those scenarios crashes Sigil. But now that Sigil is no longer in the business of overhauling, reorganizing and correcting each and every epub it opens (every time it opens them), there are going to be epubs encountered that might be broken enough to cause problems. Sigil is no longer going to be the automagic fixer of every conceivable error that that some epub's creators have inflicted on them. At the very least, an error-free OPF is going to be pretty-much a pre-requisite for ensuring that epubs can be opened in a functioning/editable state.