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DiapDealer - FWIW the msvcr90.dll in my calibre install reports VS 2008
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KevinH - I don't have any DELL software on this computer, nor anything called QCA.
As I read that Qt thread the issue was a conflict between two Qt based products. The following applications have files that match Qt*.* on this system
Program Files
(64 bit)Sigil
Calibre
Program Files (X86)
(32 bit)SQLiteBrowser
MalwareBytes
Malwarebytes puts an entry into the context menu, I found the setting to get rid of it - same result. Its an antimalware product, I run the Pro version alongside Defender. I also tried shutting it down - same result
SQLiteBrowser isn't running and doesn't put itself into the context menu, I put it into the Open With list for .db and .sqlite.
BR