In order for the icon to appear correctly in the Alt-Tab dialog, it needs to be 32x32. If elephant48.png is the same as the icon that is passed to SetIcon by pgAdmin3, then the reason Alt-Tab doesn't work is because the icon is the wrong size.
Under win32, the icon contains both 32x32 and 48x48. The 16x16 representation is generated automatically from the system.
Regards, Andreas
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