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On another machine I copied the existing 32-bit NPP config.xml and session.xml files to a temporary location and then removed 32-bit NPP before installing 64-bit NPP.
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In other words, both 32-bit and 64-installs point to the same C:\Users\%username%\AppData\Roaming\Notepad++ path so running either uninstall will remove all of these files. I would have preferred to keep my history and session data. located in C:\Users\%username%\AppData\Roaming\Notepad++. Not necessarily a problem but when you then uninstall the 32-bit version it also removes the various configuration files like config.xml, session.xml, etc. The 32-bit install ends up in C:\Program Files (x86)\Notepad++ and the 64-bit install ends up in C:\Program Files\Notepad++ as you would expect. Installing 64-bit on 64-bit Windows with 32-bit Notepad++ already installed ends up with two installations because the 64-bit installer doesn’t check to see if there is already a 32-bit version installed.
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