Barry, yes the 32 bit version installs stars in %ProgramFiles(x86)%\Stellarium\star s\default and the 64 bit one in %ProgramFiles%\Stellarium\stars\def ault and they do not check for the existence of the other directory.
Assuming a Win7 file layout, if there was a %LOCALAPPDATA%\stellarium\stars\def ault it could work for both 32 and 64 bit.
The 64 bit version should better cope with the big catalogs.
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