Win32 C++ Import path based on OS?

I'm working with some legacy code that has an import like so:

#import "C:\Program Files\Common Files\System\ado\msado15.dll" rename("EOF", "EndOfFile")
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The problem is, on a x64 machine the path for this import is in the 'Program Files (x86)' directory. Is there a preprocessor macro I can wrap around this to make it work on either?

Edit1: I think I found it. _M_X64, but im not 100% sure if this is correct. Edit2: _M_X64 seems to be for when you are compiling FOR a x64 processor. Not on one.

If you take a look at the #import statement documentation, you'll find that the search order for the (MIDL) compiler is

1. the folders in %PATH%
2. the folders in %LIB%
3. all 'additional include' directories

So you can just do `#import ' and give your compiler an /I include directory.

Use the progid/libid version of the import statement...

#import "progid:my.prog.id.1.5"

or

#import "libid:12341234-1234-1234-1234-123412341234" version("4.0") lcid("9")