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Old 2013-01-04, 20:03
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RXTX RXTX is offline
 
Join Date: May 2012
Posts: 562
If you're on Windows, open Task Manager (Ctrl + Shift + Esc), and find Reason in the Processes tab.

If it says Reason.exe, it's 64 bit; if it says Reason.exe*32, it's 32 bit.