upgrading data.table fread operation from 32-bit to 64-bit?

I tried to open up a csv and it complained about this:

 Opened 0TB (2471801935 bytes) file ok but could not memory map it. This is a 
 32bit process. Please upgrade to 64bit.

I am on a 64-bit computer and I am getting these messages. How can I upgrade this to a 64 bit operation?

Solution

Are you using x64 version of R? try running sessionInfo(). On mine I see Platform: x86_64-w64-mingw32/x64 (64-bit)

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