64 bit installation in Lightroom 2 for MAC

The readme file that came with Lightroom 2 for MAC states:
"Mac: Lightroom 2 is a 32-bit application by default. For customers using OS X 10.5 on an Intel-based computer, Lightroom 2.0 can be used as a 64-bit application by selecting Adobe Lightroom 2 in the Application folder, choosing Get Info(CMD I) and un-checking the Open in 32 Bit Mode option".
Sorry but I don't follow these instructions. The dmg file does not include a Get Info (CMD I) file. Installing Lightroom 2 to the application folder works fine, but I only find the "Adobe Lightroom.app" file. Right clicking this app file and selecting Get Info brings up the file information window, but there is no box to uncheck to turn off the 32 Bit Mode option. I don't find anything of use in the "application support file" either.
Help! What have I done wrong or am I looking in the wrong place?
iMAC description: OS X version 10.5.4; Processor 1.83 GHz Core Duo; Memory 2GB; Grpahics card ATI Radeon X1600; 128 MB VRAM; Resolution 1440 x 900; Depth 32-bit Color; Home hard drive 124 GB free with Lightroom 1 & 2 installed.

Thanks for all the responses. Didn't realize Core Due processor was not 64 bit capable. Assume that is why I don't see a check box for "Open in 32 Bit Mode" in my "Get Info" window.
Sincerely,
Jim Strain

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