Actually, I don't think it is a Windows issue. The real issue is, how would Sigil know how to order the files? Perhaps I would use a,b,c,d as numbering. Or put the number in the middle of the filename. Or perhaps no numbering at all.
Fact of the matter is, that numbering makes life easier but is no requirement for having it. How should Sigil react in all those matters?
Dragging is not always handy, especially with a long list, but it works.
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