You don't say how you re-open it, but I would guess you are double-clicking the .RData file and letting Windows look up which program to run. If so, you can either open the 64-bit GUI directly and use File Open Data to open your data, or you can change which version of the R GUI program is linked to .RData files in Windows.
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Jeff Newmiller The ..... ..... Go Live...
DCN:<jdnewmil@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go...
Live: OO#.. Dead: OO#.. Playing
Research Engineer (Solar/Batteries O.O#. #.O#. with
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Sent from my phone. Please excuse my brevity.

John Welsh <jwelsh@sdibr.org> wrote:

Dear R users,

When I Save Workspace... and then reopen it, my platform switches
from 64-bit to 32-bit, i.e. the Gui switches between these:

R version 2.13.1 (2011-07-08)
Copyright (C) 2011 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-pc-mingw32/x64 (64-bit)

R version 2.13.1 (2011-07-08)
Copyright (C) 2011 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i386-pc-mingw32/i386 (32-bit)

How come? This is a Windows x64 system.

John Welsh, Ph.D.
Associate Professor
Molecular and Cancer Biology
Vaccine Research Institute of San Diego
10835 Road to the Cure
San Diego, CA 92121
Phone: (858) 581-3960 ex.248
Email: jwelsh@sdibr.org

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