Trane did send Windows crash dumps but the failure occurs deep deep deep inside Windows system shell/icon code, not in any Sigil or even Qt code. Since the Windows system code is not opensource, we can not actually see what is happening easily. Also, none of us could recreate anything similar on any platform we support (Linux, Windows, Mac). It appears to be either a Qt or Windows issue with the specific contents of one or more image files (corrupted image files?) but without access to the exact set of images that create the issue we simply could not recreate the problem.
The fact that Windows allows 3rd party shell extensions to be involved with icon creation just makes matters worse.
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