Really weird occurence in Saving a Mac Stand alone

[Joe Lewis Wilkins]

Hi All,

You've got to hand it to me. I DO have the weirdest things happen.

I saved a Standalone. I opened the Mac OSX version. Played with it a  
bit, then decided I wanted to save a copy. So I selected the Save A  
copy As... with the following handler in  the File menu:

case "Save A Copy As..."
     answer folder "Select destination folder for backup: "
     if the result is "Cancel" then exit menupick
     revCopyFile (the effective fileName of this stack), it
     break

Then I went looking to see if the changes I'd made were actually  
saved, but lo and behold a PC exe version was where the saved copy  
should have been.

Any thoughts?
TIA,
Joe Wilkins