@eschwartz - I have both the 32bit and 64bit versions of calibre installed, AFAIK by default they use the same configuration data. Not a copy thereof - the same data, on the same drive, in the same folders using the same disk sectors. If I change a preference from the 32bit version, close it and start the 64bit version I see the change I just made to preferences from the 64bit version.
To make the 32bit & 64bit installs use different config data I think I would have to poke different values into the CALIBRE_CONFIG_DIRECTORY environment variable before running them - I've done that too, so I know it works as I expect to work.
BR
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