Kovid, it uses the instances from winsxs even if they're in the Calibre2\Microsoft.VC90.CRT folder, I should have said that, calibre portable also uses the winsxs instances.
What 'surprised' me was that I had understood (not from you) that Calibre was 'self contained' and ALWAYS used the C run time, python, qt libraries etc that ship with the product.
BR
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