Why won't 64-bit capable apps run in 64-bit mode under 10.6.8?

have application called Spartan '10, and it is 64-bit capable.  i have set it to run in 64-bit mode in the app's preference pane.  yet when i use Activity Monitor, it indicates that the app is running in 32-bit mode.  is this because of the OS?  will upgrading to lion/mtnlion make any difference?  thx in advance to all knowledgable responders.  btw, the iMac is late 2009, has the 64-bit EFI, and the OS and all related subroutines are running in 64-bit mode, according to Activity Monitor.  the Spartan application is about the only thing NOT in 64-bit mode.  why is this?

Yes.  You have a 64-bit ROM since your model will run Mountain Lion. So, what you want to do is install Mountain Lion which will boot the 64-bit kernel by default. Otherwise: 32- or 64-bit Kernel Startup Mode Selector 1.6.
Note you may have problems in 64-bit kernel mode. Main worry is video drivers that are 32-bit and will not work in the 64-bit kernel. But give it a try. I would just ugrade OS X:
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase and download Mountain Lion from the App Store. Sign in using your Apple ID. Mountain Lion is $19.99 plus tax. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
     OS X Mountain Lion - System Requirements
       Macs that can be upgraded to OS X Mountain Lion
         1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
         3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
         4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
         5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
         6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later
         7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.

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