From google, you may be able to use ProcessExplorer to find what other software has a handle to the file.
Common causes include antivirus scanners, shared drives like DropBox or Google Drive, continuous backup software, etc. So perhaps something on Windows looking inside temp is scanning the files.
I wonder if the same problem exists if we use Sigil preferences to set Sigil's temp directory to some place private to try to prevent that or if it is something happening inside of Qt/Sigil itself.
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