i am not fully sure, as i am pc based myself however an exe file is a pc executable file and will not work on mac. it is triggered by an autorun.inf file which links to the file and always accompanies it on a cd-rom.
I do not believe that there is any way that the virtual tour exe software can be used to create a stand-alone tour for a mac, a possible workaround would be to create a html based display housing for mac users.
'Macs are unable to use the AutoPlay (autorun.inf) facility which works on PCs but there is a Mac facility called AutoStart which works if QuickTime 2.0 or later is installed and AutoStart is enabled.
hope this helps
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