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My appdata\local\temp is trashed on restart, but calibre has a private TEMP via CALIBRE_TEMP_DIR. Wherever possible I give all applications private TEMP areas. Avoids rummaging around in a pile of 'who knows what' when you're looking for something.
Does the editor take checkpoints of its own accord or only when user tells it to? There primary usage seems to be more like 'super undo' rather the checkpoint/restart facilities in TP monitors like CICS, Toledo, Sabre etc. That's where I first came across 'checkpoint' - a long, long time ago.
Ideally a substantial 'editor' (ie one in which you're likely to spend a long time) should do protection saves at a user specified interval, and be able to recover from it in the event of a crash, power out, equipment failure or other abrupt termination.
BTW - AFAIK WU does a bog-standard restart. If so then Sigil (or the calibre editor) would have got a message from Windows telling it to quit, at which point it could have done a 'protection save', and made a note of that in its control data. And then offered to reload that file next time it was used.
BR
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